You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(2,4-dimethoxyphenyl)methyl]-6-fluoro-4-oxo-7-thiophen-2-yl-1,8-naphthyridine-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H17FN2O5S
assistant