You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl (4R,5R)-4-ethenyl-6-(4-methoxyphenyl)sulfonyl-4,5,7,8-tetrahydrothieno[2,3-d]azepine-5-carboxylate into its molecular formula.
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C19H21NO5S2
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