You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[3-(2-methylpropylamino)propyl]-N'-[[3-[2-[3-[[3-[3-(2-methylpropylamino)propylamino]propylamino]methyl]phenyl]phenyl]phenyl]methyl]propane-1,3-diamine by IUPAC nomenclature, provide its molecular formula.
user
C40H64N6
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