2,9-Dimethyl-7-phenyl-N-(4-methyl­phen­yl)dibenzo[b,h][1,6]naphthyridin-6-amine

The title compound, C(31)H(25)N(3), was synthesized from 6,4′,4′′-trimethyl-2,4-bis­(N-phenyl­amino)­quinoline and is the first structural example containing a phenyl and phenyl­amino fragment attached to a fused dibenzo[1,6]naphthyridine moiety. The fused tetra­cyclic ring system is essentially planar [r.m.s. deviation = 0.08 (3) Å]. The phenyl ring and the phenyl­amino group are inclined by 82.68 (6) and 35.31 (5)°, respectively, to the mean plane of the fused tetra­cyclic ring system. A weak intra­molecular N—H⋯π(arene) inter­action may in part influence the conformation of the mol­ecule. In the crystal, mol­ecules are linked by weak inter­molecular C—H⋯N hydrogen bonds into centrosymmetric dimers. Additional stabilization is provided by weak C—H⋯π and π–π stacking inter­actions [centroid–centroid distances = 3.834 (2) and 3.898 (1) Å].