You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-[3-(dimethylsulfamoyl)anilino]-1-oxopropan-2-yl] 2,4-difluorobenzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H18F2N2O5S
assistant