You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(1,1-dioxothiolan-3-yl)-3,4,5-trimethoxy-N-[(3-methylthiophen-2-yl)methyl]benzamide by IUPAC nomenclature, provide its molecular formula.
user
C20H25NO6S2
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