You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (2S)-2-amino-3-[4-[2-fluoro-4-[(3-nitropyridin-2-yl)amino]phenoxy]phenyl]propanoic acid;dihydrochloride ?
user
C20H19Cl2FN4O5
assistant