You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[(2Z)-2-methoxyimino-2-[3-(trifluoromethyl)phenyl]ethyl]-2-pyridin-3-yl-6,7-dihydropyrazolo[4,3-c]pyridin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H18F3N5O2
assistant