You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 4-methyl-N-[3-(4-methylpiperazin-4-ium-1-yl)quinoxalin-2-yl]benzenesulfonamide ?
user
C20H24N5O2S+
assistant