You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[6-[1-[(2R,3R)-2-fluoro-8-azabicyclo[3.2.1]oct-6-en-3-yl]ethenyl]pyridazin-3-yl]-5-(triazol-1-yl)phenol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H19FN6O
assistant