You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(4-propan-2-ylphenyl)-1,3-thiazol-4-yl]methyl 1-oxidopyridin-1-ium-4-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18N2O3S
assistant