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 4,7-dimethyl-2-[(3R)-3-methyl-1-(2-methylpropanoyl)piperidin-3-yl]-5H-pyrrolo[2,3-d]pyrimidin-6-one .
user
C18H26N4O2
assistant