You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[6-[(Z)-1-amino-3-methyliminoprop-1-en-2-yl]-2-methyl-1H-isoquinolin-4-yl]-2-fluoro-4-methoxyaniline The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H23FN4O
assistant