You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named acetylene;N-[(4-chlorophenyl)methyl]-2-[4-[(2-hydroxy-3-methylbutyl)amino]-1-[(5-oxopyrrolidin-2-yl)methyl]-2,5-dihydropyrrol-3-yl]acetamide;ethane by IUPAC nomenclature, provide its molecular formula.
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C27H41ClN4O3
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