2-(5,6-Dihydrobenzimidazo[1,2-c]quinazolin-6-yl)phenol

The asymmetric unit of the title compound, C20H15N3O, contains two independent molecules, each of which is disordered over two sets of sites corresponding to a rotation of approximately 180° of the dihydrobenzimidazoquinazoline moiety, with refined site occupancies of 0.7479 (13) and 0.2521 (12) for both molecules. The pyrimidine rings are in sofa conformations. In one molecule, the hydroxy-substituted benzene ring forms dihedral angles of 83.9 (3) and 82.4 (4)° for the major and minor components, respectively, with the mean plane of the benzimidazole ring system. The corresponding dihedral angles in the other molecule are 88.31 (14) and 85.8 (6)°. In the crystal, molecules are linked via intermolecular O—H⋯N and N—H.·O hydrogen bonds into chains along [100].