You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[6-[(4-carbamimidoyl-2,6-difluorobenzoyl)amino]-1-oxo-3,4-dihydro-2H-naphthalen-2-yl]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H17F2N3O4
assistant