You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-ethoxyphenyl)-4-methyl-N-[2-(4-methylpiperazin-1-yl)-2-oxoethyl]benzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H29N3O4S
assistant