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 4-[2-[6-amino-8-(2-fluorophenyl)-9-methylpurin-2-yl]ethynyl]-1-methylpiperidin-4-ol;dihydrochloride .
user
C20H23Cl2FN6O
assistant