You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(benzenesulfonyl)-4-(5-pyrrolidin-1-ylsulfonylpyridin-1-ium-2-yl)piperazine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25N4O4S2+
assistant