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The title compound, C18H22N4O2S, 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 R22(8) and R22(16) loops, respectively. This combination leads to [100] chains of mol­ecules.
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