Diethyl 1,4-bis­(4-nitro­phen­yl)-1,4-dihydro-1,2,4,5-tetra­zine-3,6-dicarboxyl­ate

The complete mol­ecule of the title compound, C20H18N6O8, is generated by a crystallographic twofold axis. The dihedral angle between the nitrobenzene rings is 43.5 (2)°. The central six-membered ring exhibits a boat conformation. In the crystal structure, weak inter­molecular C—H⋯O inter­actions are observed

Ethyl 5,5-dichloro-3-(4-chloro­phen­yl)-3a-methyl-4a-phenyl-3a,4,4a,5-tetra­hydro-3H-aziridino[2,1-d][1,2,4]triazolo[4,3-a][1,5]benzodiazepine-1-carboxyl­ate

In the title compound, C27H23Cl3N4O2, the seven-membered diazepine ring adopts a boat conformation. The triazole ring makes dihedral angles of 17.24 (8) and 82.86 (8)°, respectively, with the chloro­benzene ring and the benzene ring of the benzodiazepine unit

N-Paranitrophénylhydrazono-α-(2-méthylbenzimidazol-1-yl)glyoxylate d'éthyle

There are two independent molecules in the asymmetric unit of the title compound {systematic name: ethyl 2-(2-methyl-1H-benzimidazol-1-yl)-2-[2-(4-nitrophenyl)hydrazinylidene]ethanoate}, C18H17N5O4. Each molecule and its inversion-related partner are linked by a pair of intermolecular N—H...N hydrogen bonds, forming inversion dimers in the crystal structure