You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[6-[2-(4-fluorophenyl)imidazo[1,2-a]pyridin-3-yl]imidazo[1,2-b]pyridazin-2-yl]-3-pyridin-3-ylbenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H20FN7O
assistant