You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 5-bromo-3-(cyclopentylamino)-N-[(4,6-dimethyl-2-oxo-1H-pyridin-3-yl)methyl]-2-methanimidoylbenzamide into its molecular formula.
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C21H25BrN4O2
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