You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S)-1-(9H-fluorene-1-carbonyl)-N-[4-[(E)-2-[4-[[(2S)-1-(9H-fluorene-1-carbonyl)pyrrolidine-2-carbonyl]amino]phenyl]ethenyl]phenyl]pyrrolidine-2-carboxamide into molecular formula.
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C52H44N4O4
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