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In the title mol­ecule, C 18 H 21 ClN 2 O 3 S, the pyrimidine ring exhibits a half-chair conformation. The ethyl group is disordered between two positions in a ratio 0.74:0.26. In the crystal structure, the mol­ecules are linked into chains along the  a  axis by N—H⋯O hydrogen bonds.

Ethyl 6-(2-chlorophenyl)-4-methyl-1-(3-oxobutyl)-2-thioxo-1,2,3,6-tetrahydropyrimidine-5-carboxylate