title: 5-(Diphenyl-methyl-idene)pyrrolidin-2-one.
abstract: In the title compound, C(17)H(15)NO, the dihedral angle between the phenyl rings is 80.1 (2)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers.
authors.affiliation: Department of Applied Cosmetology and Graduate Institute of Cosmetic Science, Hungkuang University, Taichung 433,  Taiwan.
authors.forename: Tzu-Fang
authors.initials: TF
authors.lastname: Hsu
authors.forename: Yan-Ru
authors.initials: YR
authors.lastname: Chen
authors.forename: Bor-Hunn
authors.initials: BH
authors.lastname: Huang
authors.forename: Ming-Jen
authors.initials: MJ
authors.lastname: Chen