You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[6-(1-azoniabicyclo[2.2.1]heptan-1-yl)naphthalen-2-yl]ethanone;4-methylbenzenesulfonate by IUPAC nomenclature, provide its molecular formula.
user
C25H27NO4S
assistant