You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-2-(benzenesulfonamido)-9-(5,6,7,8-tetrahydro-1,8-naphthyridine-1,8-diium-2-yl)non-4-enoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H31N3O4S+2
assistant