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The title compound, C 14 H 14 BrNO 5 , has two chiral C atoms. The quaternary C atom in the oxolanone ring has an  S  configuration, while the adjacent tertiary C atom has an  R  configuration. The oxolanone ring adopts an envelope conformation, with the flap C atom lying 0.298 (3) Å from the mean plane of the remaining four atoms. In the crystal, mol­ecules are connected into chains along [010]  via  weak C—H⋯O hydrogen bonds.

(S)-3-Acetyl-3-[(R)-1-(4-bromophenyl)-2-nitroethyl]oxolan-2-one