You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(4,6-difluoro-1,3-benzothiazol-2-yl)-N-(3-methylphenyl)piperazine-1-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18F2N4OS
assistant