title: 3-{[(4Z)-1,2-Dimethyl-5-oxoimidazol-4-yl-idene]meth-yl}-4-hy-droxy-benzonitrile.
abstract: In the title compound, C(13)H(11)N(3)O(2), an intra-molecular O-H⋯N hydrogen bond generates an S(7) ring. The dihedral angle between the mean plane of the benzene ring and the imidazolidinone ring is 3.05 (2)°. In the crystal, inversion-related mol-ecules are linked by dual C-H⋯O(carbon-yl) hydrogen bonds to form a dimer with an R(2) (2)(14) graph-set motif. A C-H⋯O(hy-droxy) inter-action links pairs of mol-ecules into another type of cyclic dimer with an R(2) (2)(18) motif. The mol-ecules are further linked by C-H⋯N inter-actions to form layers parallel to (001). Offset π-π stacking [3.3877 (8) Å] is observed in the crystal structure, with an inter-planar spacing between the planes of neighboring benzene rings of 3.444 (1) Å.
authors.affiliation: Department of Chemical Engineering, Feng Chia University, 40724 Taichung,  Taiwan.
authors.forename: Hsing-Yang
authors.initials: HY
authors.lastname: Tsai
authors.forename: Ming-Jen
authors.initials: MJ
authors.lastname: Chang
authors.forename: Tzu-Chien
authors.initials: TC
authors.lastname: Fang
authors.forename: Ming-Hui
authors.initials: MH
authors.lastname: Luo
authors.forename: Kew-Yu
authors.initials: KY
authors.lastname: Chen