You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[4-chloro-3-(dimethylsulfamoyl)anilino]-2-oxoethyl] 4-oxochromene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H17ClN2O7S
assistant