You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 7-(3,4-difluorophenyl)-3-[(2-methylphenyl)methylsulfanyl]-[1,2,4]triazolo[4,3-a]pyrazin-8-one .
user
C19H14F2N4OS
assistant