You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 5-[2-fluoro-4-methoxy-5-[[(1R,2R,3S,4S)-3-[[3-(trifluoromethylsulfonyl)phenyl]carbamoyl]-2-bicyclo[2.2.1]hept-5-enyl]carbamoyl]phenyl]pyrazine-2-carboxylic acid ?
user
C28H22F4N4O7S
assistant