You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,4-dimethyl-N-(3-prop-2-enyl-6-sulfamoyl-1,3-benzothiazol-2-ylidene)benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19N3O3S2
assistant