You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl 2-(2-benzylsulfonylacetyl)imino-3-(2-methoxy-2-oxoethyl)-1,3-benzothiazole-6-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C21H20N2O7S2
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