You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named [5-[[3-(6-amino-2-methylpyrimidin-4-yl)imidazo[1,2-b]pyridazin-2-yl]amino]pyrazol-1-yl]-(azetidin-1-yl)methanone is given. What is its corresponding molecular formula?
user
C18H18N10O
assistant