You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-[4-[2-(aminomethyl)-3-fluoroprop-2-enoxy]phenyl]-N-(2,2-difluoroethyl)bicyclo[2.2.2]octane-1-carboxamide into molecular formula.
user
C21H27F3N2O2
assistant