You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-oxo-2-(2-phenylsulfanylanilino)ethyl] (1R,2R,4S)-bicyclo[2.2.1]hept-5-ene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21NO3S
assistant