You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 9-benzyl-13,17-dimethyl-18-(6-methylheptan-2-yl)-9-azahexacyclo[11.11.0.02,10.03,8.014,22.017,21]tetracosa-2(10),3,5,7-tetraene into molecular formula.
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C40H55N
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