You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3,5-dimethyl-1,3-thiazol-3-ium-2-yl)-(2-phenyl-1H-indol-3-yl)diazene;chloride into molecular formula.
user
C19H17ClN4S
assistant