O-Ethyl S-{(S)-1-oxo-1-[(R)-2-oxo-4-phenyl­oxazolidin-3-yl]propan-2-yl} carbonodi­thio­ate

In the title compound, C₁₅H₁₇NO₄S₂, synthesized by addition of O-ethylxanthic acid potassium salt to a diastereomeric mixture of (4R)-3-(2-chloro­propano­yl)-4-phenyl­oxazolidin-2-one, the oxazolidinone ring has a twist conformation on the C—C bond. The phenyl ring is inclined to the mean plane of the oxazolidinone ring by 76.4 (3)°. In the chain the methine H atom is involved in a C—H...S and a C—H...O intra­molecular inter­action. In the crystal, mol­ecules are linked by C—H...π inter­actions, forming chains along [001]. The S configuration at the C atom to which the xanthate group is attached was determined by comparison to the known R configuration of the C atom to which the phenyl group is attached.