You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-amino-7-methyl-8-[(5-methylpyridin-2-yl)amino]-N-pyridin-4-ylimidazo[1,2-b]pyridazine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18N8O
assistant