You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(4-cyanopyridin-2-yl)amino]-N-[(2R)-2-fluoro-3-hydroxy-3-methylbutyl]-4-(propan-2-ylamino)pyrrolo[1,2-b]pyridazine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H26FN7O2
assistant