You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance ethyl 5-amino-1-(5-amino-2,4-difluorophenyl)-6,7-difluoro-8-methyl-4-oxoquinoline-3-carboxylate .
user
C19H15F4N3O3
assistant