You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[3-chloro-6-(2-fluorophenyl)imidazo[1,2-b]pyridazin-7-yl]methyl]-7H-purin-6-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H12ClFN8
assistant