You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(5,7-dioxo-[1,3]dioxolo[4,5-f]isoindol-6-yl)methyl]-2-(oxaloamino)-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H14N2O10S
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