You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 9-[(3-chloro-2,6-difluorophenyl)methyl]-2-methylsulfanyl-N-(pyridin-3-ylmethyl)purin-6-amine .
user
C19H15ClF2N6S
assistant