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 5-[1-(2-hydroxyethyl)-3-pyridin-4-ylpyrazol-4-yl]-2-(2-methoxyethyl)isoindole-1,3-dione .
user
C21H20N4O4
assistant