You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-3-[(1-cyano-4-hydroxy-7-methylisoquinoline-3-carbonyl)amino]-3-(2-fluorophenyl)propanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H16FN3O4
assistant