You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
sodium;3-[2-fluoro-4-[methyl(1,2,3,4-tetrahydroquinolin-7-ylmethyl)amino]phenyl]propanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22FN2NaO2
assistant