You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (4S,4aR,8aS)-4-[(4-methylanilino)-(4-methylphenyl)methyl]-2-(4-methylphenyl)-1,4,4a,7,8,8a-hexahydroisoquinolin-3-one into molecular formula.
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C31H34N2O
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