You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(4-chloro-N-(4-methoxyphenyl)sulfonylanilino)-N-[(1S)-1-(4-ethylphenyl)ethyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H27ClN2O4S
assistant