You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-methyl-4-[2-methyl-4-[1-(1,1,2,2,2-pentafluoroethyl)cyclopropyl]phenoxy]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18F5NO2
assistant