You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(3,5-dimethylpyrazol-1-yl)-6-oxopyridazin-1-yl]-N-(6-pyrazol-1-ylpyrimidin-4-yl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19N9O2
assistant