You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 7-[2-[(1R,4S)-2-azabicyclo[2.2.1]heptan-2-yl]acetyl]-2-pyridin-3-yl-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one ?
user
C20H23N5O2
assistant