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 (4-methylphenyl)methyl (4R)-3,3-difluoro-4-[[(5-methylpyrazin-2-yl)amino]methyl]piperidine-1-carboxylate .
user
C20H24F2N4O2
assistant