rac-Ethyl4-hydroxy-4-trifluoromethyl-6-(2,4,5-trimethoxyphenyl)-2-thio-1,3-diazinane-5-carboxylate

In the title compound, C17H21F3N2O6S, the hexahydropyrimidine ring adopts a half-chair conformation: the mean plane formed by the ring atoms excluding the C atom bonded to the ethoxycarbonyl group has an r.m.s. deviation of 0.0427 angstrom and forms a dihedral angle of 66.41 (5)degrees with the benzene ring. The molecular conformation is stabilized by an intramolecular hydroxyl O-H center dot center dot center dot O-carboxyl hydrogen bond, generating an S(6) ring. In the crystal, pairs of N-H center dot center dot center dot S and N-H center dot center dot center dot O hydrogen bonds give rise to the formation of twodimensional networks lying parallel to the ab plane, which incorporate graph-set motifs R-2(2)(8) and R-2(2)(16), respectively.