You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[2-[1-[(3-fluoropyridin-2-yl)methyl]piperidin-4-yl]pyridin-4-yl]-3,5-dimethyl-1,2-oxazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23FN4O
assistant