You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2R,3R,4R)-1-[1-[2-[(4Z)-4-butylidene-5-methylidene-1-propylpyrrol-2-yl]-7-ethyl-1-methylbenzimidazol-5-yl]ethenyl]-4-ethyl-2-methylpyrrolidin-3-amine into molecular formula.
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C31H45N5
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