(R)-2-Phen-oxy-1-(4-phenyl-2-sulfan-ylidene-1,3-oxazolidin-3-yl)ethanone.

The central 1,3-oxazolidine-2-thione ring in the title compound, C(17)H(15)NO(3)S, is approximately planar with maximum deviations of 0.036 (4) and -0.041 (5) Šfor the O and methyl-ene-C atoms, respectively. The dihedral angles formed between this plane and the two benzene rings, which lie to the same side of the central plane, are 86.5 (2) [ring-bound benzene] and 50.6 (3)°. The ethan-1-one residue is also twisted out of the central plane, forming a O-C-N-C torsion angle of 151.5 (5)°. The dihedral angle formed by the benzene rings is 62.8 (2)° so that overall, the mol-ecule has a twisted U-shape. In the crystal, mol-ecules are linked into supra-molecular arrays two mol-ecules thick in the bc plane through C-H⋯O, C-H⋯S and C-H⋯π inter-actions.

(5R)-3-(2-Chloro-acet-yl)-4-methyl-5-phenyl-1,3,4-oxadiazinan-2-one.

The 1,3,4-oxadiazinan-2-one ring in the title compound, C(12)H(13)ClN(2)O(3), is in a distorted half-chair conformation. The phenyl and chloro-acetyl groups occupy axial and equatorial positions, respectively, and lie to the opposite side of the mol-ecule to the N-bound methyl substituent. Mol-ecules are consolidated in the crystal structure by C-H⋯O inter-actions.