You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[6-bromo-3-(2-chloro-5-fluorophenyl)-1-oxo-2,3-dihydroisoindol-4-yl]-2-(difluoromethyl)cyclopentane-1-carboxamide ?
user
C21H17BrClF3N2O2
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