You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[5-[1-(4-chlorophenyl)cyclobutyl]-1,3,4-thiadiazol-2-yl]-2-fluoro-5-(2,2,2-trifluoroethylsulfamoyl)benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H17ClF4N4O3S2
assistant