N-(5-Nitro­pyridin-2-yl)-5H-dibenzo[d,f][1,3]diazepine-6-carboxamide

The title compound, C(19)H(13)N(5)O(3), can be obtained from the corresponding α-amido-α-amino­nitrone in a reaction with biphenyl-2,2′-diamine. The amido–amidine core has distinctive geometrical parameters including: an outstandingly long Csp (2)—Csp (2) single bond of 1.5276 (13) Å and an amidine N—C—N angle of 130.55 (9)°. Intra­molecular N—H⋯O, N—H⋯N and C—H⋯O hydrogen bonds occur. In the crystal, mol­ecules form layers parallel to (001) via weak inter­molecular C—H⋯N inter­actions. The layers are linked via N—H⋯O hydrogen bonds and π–π inter­actions along [001] [benzene–pyridine centroid–centroid distance = 3.672 (2) Å].