You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[(4aR,8aS)-2-[1-(4-methylphenyl)ethyl]-1,3,4,5,6,7,8,8a-octahydroisoquinolin-4a-yl]phenol by IUPAC nomenclature, provide its molecular formula.
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C24H31NO
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