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

In the title compound, C(17)H(21)F(3)N(2)O(6)S, 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 Å and forms a dihedral angle of 66.41 (5)° with the benzene ring. The mol­ecular conformation is stabilized by an intra­molecular hydroxyl O—H⋯O(carbox­yl) hydrogen bond, generating an S(6) ring. In the crystal, pairs of N—H⋯S and N–H⋯O hydrogen bonds give rise to the formation of two-dimensional networks lying parallel to the ab plane, which incorporate graph-set motifs R (2) (2)(8) and R (2) (2)(16), respectively.