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 2-[4-[[8-amino-6-(4-methylpyridin-3-yl)isoquinolin-3-yl]amino]pyrazol-1-yl]propanenitrile .
user
C21H19N7
assistant