In the title compound, C30H25N3O3, the central imidazole ring forms dihedral angles of 77.34 (6), 12.56 (6) and 87.04 (6)°, respectively, with the o-nitro-benzene ring and the phenyl substituents in the 5- and 4-positions. The mol-ecular conformation is stabilized by weak intra-molecular C-H⋯π inter-actions. In the crystal, mol-ecules are linked by O-H⋯N hydrogen bonds, forming chains running parallel to the b-axis direction.