You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-[5-[(4-fluorophenyl)methyl]-1,3,4-oxadiazol-2-yl]piperidin-1-yl]-3,3-dimethylbutan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26FN3O2
assistant