(1R*,3′S*,4′R*)-4′-(4-Chlorophenyl)-3′-[(4-hydroxy-2-oxo-1,2-dihydroquinolin-3-yl)carbonyl]-1′-methylspiro[acenaphthylene-1,2′-pyrrolidin]-2-one

The title compound, C32H23ClN2O4, has a quinoline, a chlorophenyl and an acenaphthalene ring system attached to a central pyrrolidine ring, which has three stereogenic centers. Nevertheless, the compound crystallizes as a racemate with two molecules of identical chirality in the asymmetric unit. They differ in the conformation of the five-membered pyrrolidine ring; in one molecule it has an envelope conformation, while in the other molecule it has a twisted conformation. In each molecule there is an intramolecular O-H center dot center dot center dot O hydrogen bond making an S(6) ring motif. In the crystal, pairs of N-H center dot center dot center dot O hydrogen bonds produce inversion dimers with R-2(2)(8) motifs. There are also C-H center dot center dot center dot O interactions present. The crystal structure contains voids (60 angstrom(3)) within which there is no evidence of solvent molecules.