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system
Provide the molecular formula for the IUPAC named substance 5-acetyl-2-[[4-(3-hydroxyprop-1-ynyl)thiophen-2-yl]methyl]-3,4,6,6a-tetrahydro-1H-pyrrolo[3,4-c]pyrrole-3a-carboxylic acid .
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C17H20N2O4S
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