6-(4-Pyrid-yl)-3-(3,4,5-trimethoxy-phen-yl)-1,2,4-triazolo[3,4-b][1,3,4]thia-diazole.

In the mol-ecule of the title compound, C(17)H(15)N(5)O(3)S, the planar central heterocylic ring system is oriented at dihedral angles of 5.32 (4) and 9.41 (4)°, respectively with respect to trimethoxy-phenyl and pyridine rings.

3,3'-Bis(3,4,5-trimethoxy-benzo-yl)-1,1'-(o-phenyl-ene)dithio-urea ethanol solvate.

In the mol-ecule of the title compound, C(28)H(30)N(4)O(8)S(2)·C(2)H(6)O, the benzene ring is oriented at dihedral angles of 38.50 (6) and 5.68 (5)° with respect to the trimethoxy-phenyl rings, while the two trimethoxy-phenyl rings are oriented at a dihedral angle of 44.

3,6-Bis(3,4,5-trimethoxy-phen-yl)-1,2,4-triazolo[3,4-b][1,3,4]thia-diazole.

In the mol-ecule of the title compound, C(21)H(22)N(4)O(6)S, the planar central heterocyclic ring system is oriented with respect to the trimethoxy-phenyl rings at dihedral angles of 2.60 (5) and 3.60 (6)°.

N-(5-Chloro-3-methyl-1-phenyl-pyrazol-4-ylcarbon-yl)-N'-(2-methoxy-phen-yl)thio-urea.

In the title compound, C(19)H(17)ClN(4)O(2)S, the dihedral angle between the pyrazole and phenyl rings is 43.3 (3)°. The bridging unit between the pyrazole and methoxyphenyl rings is planar within 0.

3,3'-Di-2-naphthoyl-1,1'-(o-phenyl-ene)dithio-urea.

In the mol-ecule of the title compound, C(30)H(22)N(4)O(2)S(2), the central benzene ring is oriented at dihedral angles of 63.83 (3) and 1.37 (3)° with respect to the naphthalene ring systems, while the two naphthalene ring systems are oriented at a dihedral angle of 62.

6-(4-Methyl-phen-yl)-3-(3,4,5-trimethoxy-phen-yl)-1,2,4-triazolo[3,4-b][1,3,4]thiadiazole.

In the mol-ecule of the title compound, C(19)H(18)N(4)O(3)S, the central heterocylic ring system is oriented with respect to the trimethoxy-phenyl and 4-methyl-phenyl rings at dihedral angles of 1.1 (5) and 15.1 (5)°, respectively.

N-(5-Chloro-3-methyl-1-phenyl-1H-pyrazol-4-ylcarbon-yl)-N'-(2,6-dimethyl-phen-yl)thio-urea.

In the title compound, C(20)H(19)ClN(4)OS, the pyrazole ring makes dihedral angles of 89.2 (4) and 46.4 (4)° with the phenyl and substituted benzene rings, respectively; these two six-membered rings are twisted by 52.