2-(5,6-Dihydro-benzimidazo[1,2-c]quinazolin-6-yl)-5-methyl-phenol.

In the title compound, C(21)H(17)N(3)O, the imidazole ring is essentially planar, with a maximum deviation of 0.009 (1) Å. The mol-ecule is disordered over two sites corresponding to a rotation of approximately 180° with a refined occupancy ratio of 0.9180 (14):0.0820 (14). The central pyrim-idine ring makes dihedral angles of 5.02 (5), 3.97 (5) and 6.28 (5)°, respectively, with the planes of the imidazole and the terminal phenyl rings for the major component; the values for the minor component are 5.8 (7), 5.0 (6) and 8.5 (6)°, respectively. Part of the observed planarity is accounted for in terms of an intra-molecular N-H⋯O hydrogen bond. In the crystal, mol-ecules of the major component are connected by O-H⋯N hydrogen bonds, forming supra-molecular chains along the c axis.