1
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de Souza Neto LR, Montoya BO, Brandão-Neto J, Verma A, Bowyer S, Moreira-Filho JT, Dantas RF, Neves BJ, Andrade CH, von Delft F, Owens RJ, Furnham N, Silva-Jr FP. Fragment library screening by X-ray crystallography and binding site analysis on thioredoxin glutathione reductase of Schistosoma mansoni. Sci Rep 2024; 14:1582. [PMID: 38238498 PMCID: PMC10796382 DOI: 10.1038/s41598-024-52018-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 01/12/2024] [Indexed: 01/22/2024] Open
Abstract
Schistosomiasis is caused by parasites of the genus Schistosoma, which infect more than 200 million people. Praziquantel (PZQ) has been the main drug for controlling schistosomiasis for over four decades, but despite that it is ineffective against juvenile worms and size and taste issues with its pharmaceutical forms impose challenges for treating school-aged children. It is also important to note that PZQ resistant strains can be generated in laboratory conditions and observed in the field, hence its extensive use in mass drug administration programs raises concerns about resistance, highlighting the need to search for new schistosomicidal drugs. Schistosomes survival relies on the redox enzyme thioredoxin glutathione reductase (TGR), a validated target for the development of new anti-schistosomal drugs. Here we report a high-throughput fragment screening campaign of 768 compounds against S. mansoni TGR (SmTGR) using X-ray crystallography. We observed 49 binding events involving 35 distinct molecular fragments which were found to be distributed across 16 binding sites. Most sites are described for the first time within SmTGR, a noteworthy exception being the "doorstop pocket" near the NADPH binding site. We have compared results from hotspots and pocket druggability analysis of SmTGR with the experimental binding sites found in this work, with our results indicating only limited coincidence between experimental and computational results. Finally, we discuss that binding sites at the doorstop/NADPH binding site and in the SmTGR dimer interface, should be prioritized for developing SmTGR inhibitors as new antischistosomal drugs.
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Affiliation(s)
- Lauro Ribeiro de Souza Neto
- LaBECFar - Laboratory of Experimental and Computational Biochemistry of Drugs, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, Brazil
| | - Bogar Omar Montoya
- LaBECFar - Laboratory of Experimental and Computational Biochemistry of Drugs, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, Brazil
| | - José Brandão-Neto
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Harwell, UK
- Research Complex at Harwell, Harwell Science and Innovation Campus, Harwell, UK
| | - Anil Verma
- Division of Structural Biology, The Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Sebastian Bowyer
- Department of Infection Biology, London School of Hygiene and Tropical Medicine, London, UK
| | - José Teófilo Moreira-Filho
- LabMol - Laboratory for Molecular Modeling and Design, Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Rafael Ferreira Dantas
- LaBECFar - Laboratory of Experimental and Computational Biochemistry of Drugs, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, Brazil
| | - Bruno Junior Neves
- Laboratory of Cheminformatics, Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
| | - Carolina Horta Andrade
- LabMol - Laboratory for Molecular Modeling and Design, Faculty of Pharmacy, Universidade Federal de Goiás, Goiânia, Brazil
- CRAFT - Center for Research and Advancement of Fragments and Molecular Targets, University of São Paulo, São Paulo, Brazil
| | - Frank von Delft
- Diamond Light Source Ltd, Harwell Science and Innovation Campus, Harwell, UK
- Research Complex at Harwell, Harwell Science and Innovation Campus, Harwell, UK
- Centre for Medicines Discovery, University of Oxford, Oxford, UK
- Department of Biochemistry, University of Johannesburg, Johannesburg, South Africa
| | - Raymond J Owens
- Division of Structural Biology, The Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK.
- Structural Biology, Rosalind Franklin Institute, Harwell, UK.
| | - Nicholas Furnham
- Department of Infection Biology, London School of Hygiene and Tropical Medicine, London, UK.
| | - Floriano Paes Silva-Jr
- LaBECFar - Laboratory of Experimental and Computational Biochemistry of Drugs, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, Brazil.
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2
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Abstract
A series of new trifluoromethyl-substituted quinolones and hydantoin hybrids has been synthesized and evaluated against Gram-positive bacterium (Staphylococcus aureus MTCC 96) and Gram-negative bacteria (Pseudomonas aeruginosa MTCC 441, Klebsiella pneumonia MTCC 109, and Escherichia coli MTCC 442). Compound 19c, having the 6-propene group on the quinolone ring, showed similar activity to a standard drug (chloramphenicol) by exhibiting MIC values of 50 µg/mL against S. aureus and P. aeruginosa. Physicochemical properties of compound 19c were also determined, which were in line with Lipinski’s rule of five, suggesting the suitability of compound 19c in biological systems. Various types of binding interactions of 19c within the active site of DNA gyrase of S. aureus were also streamlined by molecular docking studies, suggesting its capability to block the catalytic process of the DNA gyrase, which could be the possible reason for its antibacterial potential.
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3
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Evaluation of xanthene-appended quinoline hybrids as potential leads against antimalarial drug targets. Mol Divers 2022; 27:709-727. [PMID: 35583686 DOI: 10.1007/s11030-022-10450-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 04/22/2022] [Indexed: 10/18/2022]
Abstract
A series of fused heterocycle xanthene-appended quinoline 6a-n was successfully synthesized with regioselectivity and characterized using IR, 1H NMR, 13C NMR, and mass spectral data. Molecular docking was performed to find the binding efficacy of all these newly synthesized compounds towards thirteen antimalarial drug targets. Molecular dynamics simulation was carried out to predict the stability of the ligand-bound complex in a solvent medium. Blind and site-directed docking with compounds 6a-n against 13 drug targets revealed most of the ligands to have a good binding affinity with the targets. Analysis on the basis of binding energy, binding modalities of the ligands, intermolecular interactions, and pharmacophore, we identified only one of the ligand-receptor complexes to provide better results. Molecular dynamic simulation of the selected receptor-ligand complex revealed that the synthesized compound had a better binding affinity with the receptor than the native ligand complex. Further analysis of the synthesized ligand in the laboratory may prove promising results in the search for potential antimalarial drugs.
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4
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Hossain MI, Khan MIH, Kim SJ, Le HV. Synthesis of 3,4,5-trisubstituted isoxazoles in water via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides. Beilstein J Org Chem 2022; 18:446-458. [PMID: 35529890 PMCID: PMC9039522 DOI: 10.3762/bjoc.18.47] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Accepted: 04/08/2022] [Indexed: 11/23/2022] Open
Abstract
Herein we report a method for the synthesis of 3,4,5-trisubstituted isoxazoles in water under mild basic conditions at room temperature via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides. We optimized the reaction conditions to control the selectivity of the production of isoxazoles and circumvent other competing reactions, such as O-imidoylation or hetero [3 + 2]-cycloaddition. The reaction happens fast in water and completes within 1–2 hours, which provides an environmentally friendly access to 3,4,5-trisubstituted isoxazoles, an important class of structures found in numerous bioactive natural products and pharmaceuticals. Additionally, we optimized the reaction conditions to produce trifluoromethyl-substituted isoxazoles, a prevalent scaffold in biomedical research and drug discovery programs. We also proposed a plausible mechanism for the selectivity of the [3 + 2]-cycloaddition reaction to produce 3,4,5-trisubstituted isoxazoles. Not to be overlooked are our optimized reaction conditions for the dimerization of hydroximoyl chlorides to form furoxans also known as 1,2,5-oxadiazole 2-oxides, a class of structures with important biological activities due to their unique electronic nature and coordination ability.
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Affiliation(s)
- Md Imran Hossain
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, Mississippi 38677, USA
| | - Md Imdadul H Khan
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, Mississippi 38677, USA
| | - Seong Jong Kim
- Natural Products Utilization Research Unit, United States Department of Agriculture, Agricultural Research Service, University of Mississippi, Mississippi 38677, USA
| | - Hoang V Le
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, Mississippi 38677, USA
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5
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Dziwornu GA, Attram HD, Gachuhi S, Chibale K. Chemotherapy for human schistosomiasis: how far have we come? What's new? Where do we go from here? RSC Med Chem 2020; 11:455-490. [PMID: 33479649 PMCID: PMC7593896 DOI: 10.1039/d0md00062k] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 03/22/2020] [Indexed: 01/11/2023] Open
Abstract
Globally, schistosomiasis threatens more than 700 million lives, mostly children, in poor localities of tropical and sub-tropical areas with morbidity due to acute and chronic pathological manifestations of the disease. After a century since the first antimonial-based drugs were introduced to treat the disease, anti-schistosomiasis drug development is again at a bottleneck with only one drug, praziquantel, available for treatment purposes. This review focuses on promising chemotypes as potential starting points in a drug discovery effort to meet the urgent need for new schistosomicides.
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Affiliation(s)
- Godwin Akpeko Dziwornu
- Department of Chemistry , University of Cape Town , Rondebosch 7701 , South Africa . ; Tel: +27 21 6502553
| | - Henrietta Dede Attram
- Department of Chemistry , University of Cape Town , Rondebosch 7701 , South Africa . ; Tel: +27 21 6502553
| | - Samuel Gachuhi
- Department of Chemistry , University of Cape Town , Rondebosch 7701 , South Africa . ; Tel: +27 21 6502553
| | - Kelly Chibale
- Department of Chemistry , University of Cape Town , Rondebosch 7701 , South Africa . ; Tel: +27 21 6502553
- Drug Discovery and Development Centre (H3D) , University of Cape Town , Rondebosch 7701 , South Africa
- Institute of Infectious Disease and Molecular Medicine , University of Cape Town , Rondebosch 7701 , South Africa
- South African Medical Research Council Drug Discovery and Development Research Unit , University of Cape Town , Rondebosch 7701 , South Africa
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6
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Tang Z, Zhou Y, Song Q. Synthesis of Furoxans and Isoxazoles via Divergent [2 + 1 + 1 + 1] Annulations of Sulfoxonium Ylides and tBuONO. Org Lett 2019; 21:5273-5276. [DOI: 10.1021/acs.orglett.9b01876] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Zhonghe Tang
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering at Huaqiao University, 668 Jimei Boulevard, Xiamen, Fujian 361021, China
| | - Yao Zhou
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering at Huaqiao University, 668 Jimei Boulevard, Xiamen, Fujian 361021, China
| | - Qiuling Song
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering at Huaqiao University, 668 Jimei Boulevard, Xiamen, Fujian 361021, China
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian 350108, China
- State Key Laboratroy of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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7
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Eweas AF, Allam G. Targeting thioredoxin glutathione reductase as a potential antischistosomal drug target. Mol Biochem Parasitol 2018; 225:94-102. [DOI: 10.1016/j.molbiopara.2018.09.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 09/09/2018] [Accepted: 09/30/2018] [Indexed: 11/30/2022]
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8
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Are Antimalarial Hybrid Molecules a Close Reality or a Distant Dream? Antimicrob Agents Chemother 2017; 61:AAC.00249-17. [PMID: 28289029 DOI: 10.1128/aac.00249-17] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Emergence of drug-resistant Plasmodium falciparum strains has led to a situation of haste in the scientific and pharmaceutical communities. Hence, all their efforts are redirected toward finding alternative chemotherapeutic agents that are capable of combating multidrug-resistant parasite strains. In light of this situation, scientists have come up with the concept of hybridization of two or more active pharmacophores into a single chemical entity, resulting in "antimalarial hybrids." The approach has been applied widely for generation of lead compounds against deadly diseases such as cancer and AIDS, with a proven potential for use as novel drugs, but is comparatively new in the sphere of antimalarial drug discovery. A sudden surge has been evidenced in the number of studies on the design and synthesis of hybrids for treating malaria and may be regarded as proof of their potential advantages over artemisinin-based combination therapy (ACT). However, it is evident from recent studies that most of the potential advantages of antimalarial hybrids, such as lower toxicity, better pharmacokinetics, and easier formulation, have yet to be realized. A number of questions left unaddressed at present need to be answered before this approach can progress to the late stages of clinical development and prove their worth in the clinic. To the best of our knowledge, this compilation is the first attempt to shed light on the shortcomings that are surfacing as more and more studies on molecular hybridization of the active pharmacophores of known antimalarials are being published.
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9
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Fershtat LL, Makhova NN. Molecular Hybridization Tools in the Development of Furoxan-Based NO-Donor Prodrugs. ChemMedChem 2017; 12:622-638. [DOI: 10.1002/cmdc.201700113] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 03/27/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Leonid L. Fershtat
- N. D. Zelinsky Institute of Organic Chemistry; Russian Academy of Sciences; Leninsky Prosp. 47 Moscow 119991 Russian Federation
| | - Nina N. Makhova
- N. D. Zelinsky Institute of Organic Chemistry; Russian Academy of Sciences; Leninsky Prosp. 47 Moscow 119991 Russian Federation
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10
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Mishra M, Mishra VK, Kashaw V, Iyer AK, Kashaw SK. Comprehensive review on various strategies for antimalarial drug discovery. Eur J Med Chem 2016; 125:1300-1320. [PMID: 27886547 DOI: 10.1016/j.ejmech.2016.11.025] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 11/07/2016] [Accepted: 11/11/2016] [Indexed: 01/14/2023]
Abstract
The resistance of malaria parasites to existing drugs carries on growing and progressively limiting our ability to manage this severe disease and finally lead to a massive global health burden. Till now, malaria control has relied upon the traditional quinoline, antifolate and artemisinin compounds. Very few new antimalarials were developed in the past 50 years. Among recent approaches, identification of novel chemotherapeutic targets, exploration of natural products with medicinal significance, covalent bitherapy having a dual mode of action into a single hybrid molecule and malaria vaccine development are explored heavily. The proper execution of these approaches and proper investment from international agencies will accelerate the discovery of drugs that provide new hope for the control or eventual eradication of this global infectious disease. This review explores various strategies for assessment and development of new antimalarial drugs. Current status and scientific value of previous approaches are systematically reviewed and new approaches provide a pragmatic forecast for future developments are introduced as well.
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Affiliation(s)
- Mitali Mishra
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour University (A Central University), Sagar, MP, India
| | - Vikash K Mishra
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour University (A Central University), Sagar, MP, India
| | - Varsha Kashaw
- SVN Institute of Pharmaceutical Sciences, SVN University, Sagar, MP, India
| | - Arun K Iyer
- Use-inspired Biomaterials & Integrated Nano Delivery (U-BiND) Systems Laboratory, Department of Pharmaceutical Sciences, Wayne State University, Detroit, MI, USA
| | - Sushil Kumar Kashaw
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour University (A Central University), Sagar, MP, India; Use-inspired Biomaterials & Integrated Nano Delivery (U-BiND) Systems Laboratory, Department of Pharmaceutical Sciences, Wayne State University, Detroit, MI, USA.
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11
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Shaveta, Mishra S, Singh P. Hybrid molecules: The privileged scaffolds for various pharmaceuticals. Eur J Med Chem 2016; 124:500-536. [PMID: 27598238 DOI: 10.1016/j.ejmech.2016.08.039] [Citation(s) in RCA: 319] [Impact Index Per Article: 39.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 07/21/2016] [Accepted: 08/17/2016] [Indexed: 12/22/2022]
Abstract
The practice of polypharmacology is not a new concept but the approaches which are being adopted for administering the two or more drugs together are varied from time to time. Taking two or more drugs simultaneously, co-formulation of two or more active agents in a single tablet and development of hybrid molecular entities capable to modulate multiple targets are the three popular approaches for multidrug therapy. The simultaneous use of more than one drug for the chemotherapy of a single disease demands a lot of patient compliance. Hence the present form of polypharmacology is gaining popularity in the form of hybrid molecules (multiple ligand approach). From the last 1-2 decades, the synthesis of hybrid molecules by the combination of different biologically relevant moieties has been under constant escalation along with their evaluation as diverse range of pharmacological agents and as potent drugs. This review is focused on the biological potential of hybrid molecules with particular mention of those exhibiting anti-fungal, anti-tuberculosis, anti-malarial, anti-inflammatory and anti-cancer activities. A comparison of the drug potency of the hybrid molecules with their individual counterparts is discussed for quantifying the significance of the concept of molecular hybridisation.
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Affiliation(s)
- Shaveta
- UGC Sponsored Centre for Advanced Studies, Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005, India
| | - Sahil Mishra
- UGC Sponsored Centre for Advanced Studies, Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005, India
| | - Palwinder Singh
- UGC Sponsored Centre for Advanced Studies, Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005, India.
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12
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Wang T, van der Vlies AJ, Uyama H, Hasegawa U. Nitric oxide-releasing polymeric furoxan conjugates. Polym Chem 2015. [DOI: 10.1039/c5py01335f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polymeric nitric oxide (NO) donors were prepared by the conjugation of the azide-containing furoxans and poly(ethylene glycol) having an alkyne end groupviathe copper-catalyzed Huisgen cycloaddition.
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Affiliation(s)
- Tengjiao Wang
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
| | | | - Hiroshi Uyama
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
| | - Urara Hasegawa
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
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13
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Mfuh AM, Larionov OV. Heterocyclic N-Oxides - An Emerging Class of Therapeutic Agents. Curr Med Chem 2015; 22:2819-57. [PMID: 26087764 PMCID: PMC4711945 DOI: 10.2174/0929867322666150619104007] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 05/22/2015] [Accepted: 06/18/2015] [Indexed: 11/22/2022]
Abstract
Heterocyclic N-oxides have emerged as potent compounds with anticancer, antibacterial, antihypertensive, antiparasitic, anti-HIV, anti-inflammatory, herbicidal, neuroprotective, and procognitive activities. The N-oxide motif has been successfully employed in a number of recent drug development projects. This review surveys the emergence of this scaffold in the mainstream medicinal chemistry with a focus on the discovery of the heterocyclic N-oxide drugs, N-oxide-specific mechanisms of action, drug-receptor interactions and synthetic avenues to these compounds. As the first review on this subject that covers the developments since 1950s to date, it is expected that it will inspire wider implementation of the heterocyclic N-oxide motif in the rational design of new medicinal agents.
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Affiliation(s)
| | - O V Larionov
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas, United States.
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14
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Thakur A, Khan SI, Rawat DS. Synthesis of piperazine tethered 4-aminoquinoline-pyrimidine hybrids as potent antimalarial agents. RSC Adv 2014. [DOI: 10.1039/c4ra02276a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Piperazine linked 4-aminoquinoline-pyrimidine hybrids were synthesized and evaluated for in vitro antimalarial activity against W2 and D6 strains of plasmodium falciparum.
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Affiliation(s)
- Anuj Thakur
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
| | - Shabana I. Khan
- National Center for Natural Products Research
- School of Pharmacy
- University of Mississippi
- , USA
| | - Diwan S. Rawat
- Department of Chemistry
- University of Delhi
- Delhi-110007, India
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15
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Singh K, Kaur H, Smith P, de Kock C, Chibale K, Balzarini J. Quinoline–Pyrimidine Hybrids: Synthesis, Antiplasmodial Activity, SAR, and Mode of Action Studies. J Med Chem 2013; 57:435-48. [DOI: 10.1021/jm4014778] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kamaljit Singh
- Department
of Chemistry, UGC Centre of Advance Study-I, Guru Nanak Dev University, Amritsar, Punjab 143005, India
| | - Hardeep Kaur
- Department
of Chemistry, UGC Centre of Advance Study-I, Guru Nanak Dev University, Amritsar, Punjab 143005, India
| | - Peter Smith
- Division
of Pharmacology, Department of Medicine, University of Cape Town, Observatory 7925, South Africa
| | - Carmen de Kock
- Division
of Pharmacology, Department of Medicine, University of Cape Town, Observatory 7925, South Africa
| | - Kelly Chibale
- Department
of Chemistry, Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Rondebosch 701, South Africa
| | - Jan Balzarini
- Rega
Institute for Medical Research, KU Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium
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