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system
Name the molecular formula for the molecule established as 3-[4-ethoxycarbonyl-5-methyl-2-[(Z)-(4,4,8-trioxo-2,7-dihydro-1H-oxathiino[4,3-e]indol-9-ylidene)methyl]-1H-pyrrol-3-yl]propanoic acid using the IUPAC nomenclature.
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C22H22N2O8S
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