You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-fluoro-4-[(1R)-1-[6-(trifluoromethyl)pyridin-3-yl]ethyl]piperidin-1-yl]-(2-pyrimidin-4-ylpyridin-3-yl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H21F4N5O
assistant