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 1-(4-chlorophenyl)-4-hydroxy-N-(4-methoxyphenyl)-6-oxo-7H-pyrazolo[3,4-b]pyridine-5-carboxamide .
user
C20H15ClN4O4
assistant