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 (5-bromo-2,3-dihydroindol-1-yl)-[(3R)-1-[(2,4-dichlorophenyl)methyl]piperidin-3-yl]methanone ?
user
C21H21BrCl2N2O
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