You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(4-bromophenyl)-N-pyridin-3-yl-7-(trifluoromethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[1,5-a]pyrimidin-8-ium-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H16BrF3N5O+
assistant