You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,4-dichloro-N-[3-[1-oxo-1-(4-sulfamoylanilino)propan-2-yl]sulfanylphenyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H19Cl2N3O4S2
assistant