You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[N-(benzenesulfonyl)-3-chloro-4-fluoroanilino]-N-[3-(4-fluorophenyl)propyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H21ClF2N2O3S
assistant