Crystal structure and Hirshfeld surface analysis of ethyl (3E)-5-(4-chloro-phen-yl)-3-{[(4-chloro-phen-yl)formamido]-imino}-7-methyl-2H,3H,5H-[1,3]thia-zolo[3,2-a]pyrimidine-6-carboxyl-ate.

In the title mol-ecule, C23H20Cl2N4O3S, the thia-zole ring is planar while the pyrimidine unit fused to it adopts a screw-boat conformation. In the crystal, thick sheets parallel to the bc plane are formed by N-H⋯N, C-H⋯N and C-H⋯O hydrogen bonds together with π-π inter-actions between the formamido carbonyl groups and the thia-zole rings. Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H⋯H (30.9%), Cl⋯H/H⋯Cl (20.7%), C⋯H/H⋯C (16.8%) and O⋯H/H⋯O (11.4%) inter-actions.