title: (E)-4-[(1-Benzyl-4-benzyl-idene-2,5-di-oxopyrrolidin-3-yl)meth-yl]benzalde-hyde 0.25-hydrate.
abstract: The crystal structure of the title compound, C(26)H(21)NO(3)·0.25H(2)O, reveals one stereogenic centre in the mol-ecule. Nevertheless, due to the observed centrosymmetric space group, both enanti-omers are present in the crystal packing. The water molecule of crystallisation is located on a crystallographic inversion center. The mol-ecule contains one five-membered ring (A) and three six-membered rings (benzyl ring B, benzyl-idene ring C and formyl-benzyl ring D). All four rings are not coplanar: the dihedral angles between rings A and B, A and C, and A and D are 70.35 (9), 33.8 (1) and 60.30 (9)°, respectively. In the crystal, pairs of weak C-H⋯O inter-actions lead to the formation of centrosymmetric dimers. Additional C-H⋯O inter-actions link the dimers into chains along [011].
authors.affiliation: School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000,  People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Yu
authors.forename: Yimin
authors.initials: Y
authors.lastname: Hu