Crystal structure of ethyl 4-(2,4-di­chloro­phen­yl)-2-methyl-4H-benzo[4,5]thia­zolo[3,2-a]pyrimidine-3-carboxyl­ate

In the title compound, C(20)H(16)Cl(2)N(2)O(2)S, the pyrimidine ring has a screw-boat conformation. The attached di­chloro­phenyl ring is twisted at an angle of 89.29 (13)° with respect to the pyrimidine ring mean plane. The benzo­thia­zole group is approximately planar (r.m.s. deviation = 0.008 Å) and inclined to the pyrimidine ring mean plane by 3.04 (10)°. The carboxyl­ate group assumes an extended conformation with respect to the pyrimidine ring, which can be seen from the O=C—O—C torsion angle of 3.2 (4) °. In the crystal, mol­ecules are linked via C—H⋯O and C—H⋯N hydrogen bonds, forming slabs lying parallel to (100).