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 N-[(5-bromo-2-fluorophenyl)methyl]-3-methylsulfonyl-N-prop-2-enylimidazo[1,5-a]pyridine-1-carboxamide .
user
C19H17BrFN3O3S
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