You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[1-(3,4-dihydro-2H-1,5-benzodioxepin-7-yl)-2-methylpropyl]amino]-1-[4-(4-methoxyphenyl)piperazin-1-yl]ethanone by IUPAC nomenclature, provide its molecular formula.
user
C26H35N3O4
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