You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl 3-[N-[(2-methyl-4-oxo-3,5-dihydro-2H-1,5-benzothiazepin-7-yl)sulfonyl]anilino]propanoate into its molecular formula.
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C20H22N2O5S2
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