You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-(2-methoxyphenyl)-N-(pyridin-2-ylmethyl)-[1,2,4]triazolo[4,3-b]pyridazine-6-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H16N6O2
assistant