You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(1R)-1-cyanoethyl]amino]-6-(3-ethynylpyrrolo[1,2-b]pyridazin-7-yl)-N-[(2R)-2-fluoro-3-hydroxy-3-methylbutyl]pyridine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H23FN6O2
assistant