You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(E)-[3,5-difluoro-4-[4-[(2-methylphenyl)methyl]piperazin-1-yl]phenyl]methylideneamino]thiourea into molecular formula.
user
C20H23F2N5S
assistant