You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-N-[2-methylsulfanyl-5-[[3-(trifluoromethyl)phenyl]methylsulfamoyl]phenyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21F3N2O3S2
assistant