Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.002 Å; R factor = 0.039; wR factor = 0.108; data-to-parameter ratio = 17.2.The seven-membered ring in the title compound, C 13 H 16 N 2 O 2 , adopts a boat-shaped conformation (with the C atoms of the fused-ring as the stern and the C atom bearing two methyl groups) as the prow. Related literature

The title compound, C26H24N2O2, features a benzene ring fused with a seven-membered diazepine ring; the latter ring adopts a boat conformation (with the allyl­dimethyl­amino­methyl-bearing C atom as the prow and the fused-ring C atoms as the stern).

The seven-membered ring of the title compound, C25H40N2O2, adopts a boat-shaped conformation (with the C atoms of the fused-ring as the stern and the methine C atom as the prow). The tetra­decyl substituent occupies an equatorial position, with the tetra­dodecyl chain exhibibiting an an all-trans conformation.

The benzimidazolone part of the mol­ecule of the title compound, C15H21N3O3, is almost planar (r.m.s. deviation = 0.007 Å) with its mean plane aligned at a dihedral angle of 10.4 (3)° with respect to the mean plane of the nitro substituent. In the crystal, two mol­ecules are disposed about a center of inversion, generating an N—H⋯O hydrogen-bonded cyclic dimer with R 2 2(8) graph-set motif.

The fused-ring system of the title compound, C27H28N2O7, which comprises one five- and three six-membered rings, is approximately planar (r.m.s. deviation = 0.133 Å), the system being buckled along the axis passing through the O atoms of the anthraquinone portion of the mol­ecule. Within the anthraquinone portion, the two benzene rings are aligned at 7.3 (2)°. In the crystal, one of the tert-butyl groups is disordered over two sets of sites in a 1:1 ratio. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure.