You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-ethyl-6-[2-(ethylaminomethyl)-3-fluoro-1-methylindol-5-yl]-4-hydroxy-2-oxo-1H-pyridine-3-carboxylic acid;hydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23ClFN3O4
assistant