You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-chloro-2-[1-hydroxy-1-(1-oxidopyridin-1-ium-4-yl)prop-2-enyl]phenyl]-4-prop-1-en-2-ylbenzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H21ClN2O4S
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