You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[2-[1-(3-isothiocyanatopropyl)pyridin-1-ium-4-yl]ethenyl]-N,N-dimethylaniline is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22N3S+
assistant