You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2S)-2-[[2-[4-(2,4-dimethylphenyl)sulfonylpiperazin-1-ium-1-yl]acetyl]amino]-N-propylpropanamide into its molecular formula.
user
C20H33N4O4S+
assistant