You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-ethyl-N-(4-methylphenyl)sulfonylanilino)-N-[3-(4-methylpiperazin-1-yl)propyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H36N4O3S
assistant