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The crystal structure of the title compound, C 26 H 21 NO 3 ·0.25H 2 O, reveals one stereogenic centre in the mol­ecule. Nevertheless, due to the observed centrosymmetric space group, both enanti­omers are present in the crystal packing. The water molecule of crystallisation is located on a crystallographic inversion center. The mol­ecule contains one five-membered ring ( A ) and three six-membered rings (benzyl ring  B , benzyl­idene ring  C  and formyl­benzyl 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 inter­actions lead to the formation of centrosymmetric dimers. Additional C—H⋯O inter­actions link the dimers into chains along [011].

(E)-4-[(1-Benzyl-4-benzylidene-2,5-dioxopyrrolidin-3-yl)methyl]benzaldehyde 0.25-hydrate