You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[(9-cyclopentyl-5-methyl-6-oxo-7,8-dihydropyrimido[4,5-b][1,4]diazepin-2-yl)amino]-N-[2-(1H-imidazol-5-yl)ethyl]-4-methoxybenzamide by IUPAC nomenclature, provide its molecular formula.
user
C26H32N8O3
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