You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-(5-pyridin-4-ylheptan-3-yl)-1-[[4-[[4-(5-pyridin-4-ylheptan-3-yl)pyridin-1-ium-1-yl]methyl]phenyl]methyl]pyridin-1-ium into molecular formula.
user
C42H52N4+2
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