(4S)-4-[(R)-Chloro­(4-nitro­phen­yl)meth­yl]-1,3-oxazolidin-2-one

In the title compound, C₁₀H₉ClN₂O₄, the oxazolidinone ring adopts a near-planar conformation, with mean and maximum deviations of 0.0204 (8) and 0.0328 (8) Å, respectively. The nitro group is twisted slightly from the plane of the benzene ring, making a dihedral angle of 6.79 (3)°. The dihedral angle between the mean oxazolidinone plane and the benzene ring is 56.21 (3)°. In the crystal, N—H...O hydrogen bonds and N—O...π inter­actions [O...centroid distances = 3.478 (1) and 3.238 (1) Å] dominate the packing, forming infinite zigzag chains along the b-axis direction. Neighbouring chains are linked together through C—H...O and C—H...Cl inter­actions. The absolute configuration of the two stereogenic centres was determined using the anomalous dispersion of the Cl atom.

[(2R,3R)-3-(4-Nitro­phen­yl)aziridin-2-yl]methanol monohydrate

The title monohydrate, C₉H₁₀N₂O₃·H₂O, contains an aziridine ring including two contiguous stereocenters, both of which exhibit an R configuration. The methyl­hydroxy and nitro­phenyl groups are cis-disposed about the aziridine ring. The mean plane of the benzene ring is tilted to the aziridine ring by 66.65 (8)°. The nitro group is nearly coplanar with the benzene ring [dihedral angle = 2.5 (2)°]. In the crystal, the components are linked by N—H...O, O—H...N and O—H...O hydrogen bonds, generating supra­molecular layers parallel to (001).