You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-chloro-4-fluorophenyl)-3-[4-[(4,6-dimethylpyrimidin-2-yl)sulfamoyl]phenyl]thiourea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H17ClFN5O2S2
assistant