You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7,8-dimethyl-4-oxo-N-[4-(1,3-thiazol-2-ylsulfamoyl)phenyl]chromene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H17N3O5S2
assistant