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The title compound, C 18 H 22 N 4 O 2 S, contains a substituted pyrimidine ring fused to both a benzene ring and a substituted thioxopyrimidine ring. The pyrimidine and thioxopyrimidine rings adopt distorted chair conformations. In the crystal, adjacent mol­ecules are linked by pairs of N—H⋯S and N—H⋯O hydrogen bonds to generate centrosymmetric  R   2   2 (8) and  R   2   2 (16) loops, respectively. This combination leads to [100] chains of mol­ecules.

Ethyl 2-methyl-6-(propan-2-ylamino)-4-sulfanylidene-3H,11H-pyrimido[1,6-c]quinazoline-1-carboxylate