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The title compound, C 19 H 21 N 3 O 3 S, was synthesized  via  the aza-Wittig reaction of functionalized imino­phospho­rane with phenyl isocyanate under mild conditions. In the mol­ecule, the fused thienopyrimidine ring system is essentially planar, with a maximum deviation of 0.072 (2) Å, and makes a dihedral angle of 60.11 (9)° with the phenyl ring. An intra­molecular C—H⋯O hydrogen bond is present. The crystal packing is stabilized by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds.

Ethyl 5-methyl-4-oxo-3-phenyl-2-propylamino-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylate