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 2-[[7-but-2-ynyl-3-methyl-8-[(3R)-3-methylpiperidin-1-yl]-2,6-dioxopurin-1-yl]methyl]-6-fluorobenzonitrile .
user
C24H25FN6O2
assistant