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system
Provide the molecular formula for the IUPAC named substance ethyl 2-[[4-[(2,5-dioxopyrrolidin-1-yl)methyl]benzoyl]amino]-6,6-dioxo-5,7-dihydro-4H-thieno[2,3-c]thiopyran-3-carboxylate .
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C22H22N2O7S2
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