You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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4-[[4-hydroxy-3-(1H-pyrrol-2-yliminomethyl)phenyl]methyl]-2-(1H-pyrrol-2-yliminomethyl)phenol is the IUPAC name of a molecule. Please give its molecular formula.
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C23H20N4O2
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