You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(5-ethyl-5-methyl-4H-1,3-thiazol-2-yl)-1H-indol-7-yl]-N-methylthiophene-2-sulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21N3O2S3
assistant