You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(3-cyclopropyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)azetidin-3-yl]-N-methylpyridine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H19N7O
assistant