You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name propyl (2S)-2-[5-(4-fluorophenyl)-6-methyl-4-oxothieno[2,3-d]pyrimidin-3-yl]propanoate into its molecular formula.
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C19H19FN2O3S
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