You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [4-[6-[4-bromo-3-(trifluoromethyl)phenyl]spiro[2.4]hept-5-en-5-yl]phenyl]methanesulfonamide ?
user
C21H19BrF3NO2S
assistant