You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[9-(2,2-difluoro-1-phenylethyl)-6-fluoro-8-methylsulfonyl-1,2,3,4-tetrahydrocarbazol-1-yl]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H22F3NO4S
assistant