You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-methyl-4-[6-[4-[2-(4-nitrophenoxy)ethyl]piperazin-1-yl]hexan-3-yl]benzonitrile by IUPAC nomenclature, provide its molecular formula.
user
C26H34N4O3
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