You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named prop-2-enyl (2Z,5S)-2-[(2,5-dimethoxyphenyl)methylidene]-5-(4-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C27H26N2O6S
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