N-[1-(5-Acetamido-3-acetyl-2-methyl-2,3-dihydro-1,3,4-thia-diazol-2-yl)-2-phenyl-ethyl]acetamide

N-[4-Acetyl-5-(2-methylprop-1-enyl)-5-(2-p-tolyl-prop-yl)-4,5-dihydro-1,3,4-thia-diazol-2-yl]acetamide

The title heterocyclic compound, C(20)H(27)N(3)O(2)S, was synthesized from 2-(4-methyl-cyclo-hex-3-en-yl)-6-methyl-hepta-2,5-dien-4-one, which was isolated from the essential oil Cedrus atlantica. The thia-diazole ring is essentially planar [maximum deviation 0.006 (2) Å] and it forms a dihedral angle of 18.08 (9)° with the benzene ring. The dihedral angle between the thia-diazole ring and the acetamide plane is 7.62 (10)°. In the crystal, mol-ecules are linked into chains running along the c axis by inter-molecular N-H⋯O hydrogen bonds.

N-[4-Acetyl-5-methyl-5-(2-p-tolyl-prop-yl)-4,5-dihydro-1,3,4-thia-diazol-2-yl]acetamide

The title heterocyclic compound, C(17)H(23)N(3)O(2)S, was synthesized from 4-(4-methyl-cyclo-hex-3-en-yl)pent-3-en-2-one, which was isolated from Cedrus atlantica essential oil. The thia-diazole ring adopts a flattened envelope conformation, with the flap sp(3)-hybridized C atom lying 0.259 (1) Å out of the plane of the other four atoms. The screw-related mol-ecules are linked into chains along the b axis by inter-molecular N-H⋯O hydrogen bonds.

N-[4-Acetyl-5-isobutyl-5-(2-p-tolyl-prop-yl)-4,5-dihydro-1,3,4-thia-diazol-2-yl]acetamide ethyl acetate hemisolvate

The racemic title compound, a new terpenoid, C₂₀H₂₉N₃O₂S·0.5C₄H₈O₂, was synthesized from Cedrus Atlantica essential oil. The compound crystallizes with a disordered ethyl acetate solvent mol­ecule. The thia­diazole ring is almost planar, with a maximum deviation from the mean plane of 0.015 (2) Å for the C atom connected to the isobutyl group and has a puckering amplitude of 0.026 (2) Å. The dihedral angle between the benzene and thia­diazole rings is 18.32 (8)°. The crystal packing involves inter­molecular N—H⋯O hydrogen bonds.