(Z)-Ethyl 2-(2,4-dimethyl-benzyl-idene)-7-methyl-3-oxo-5-phenyl-3,5-dihydro-2H-thia-zolo[3,2-a]pyrimidine-6-carboxyl-ate.

In the title compound, C(25)H(24)N(2)O(3)S, the dihedral angles between the thia-zole ring and the phenyl and substituted benzene rings are 84.91 (11) and 11.58 (10)°, respectively. The dihydro-pyrimidine ring adopts a flattened boat conformation. The olefinic double bond is in a Z configuration.