You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-fluoro-N-[4-methoxy-3-[(4-methoxyphenyl)sulfamoyl]phenyl]-3-(trifluoromethyl)benzamide by IUPAC nomenclature, provide its molecular formula.
user
C22H18F4N2O5S
assistant