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-[3-(3,4-dimethoxyphenyl)-5-oxo-4H-pyrazolo[1,5-a]pyrimidin-7-yl]piperidine-1-carboxylic acid .
user
C20H22N4O5
assistant