You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-bromo-7-[(4-chloro-3,5-dimethyl-1-oxidopyridin-1-ium-2-yl)methyl]-5-propan-2-ylpyrrolo[2,3-d]pyrimidin-2-amine .
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C17H19BrClN5O
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