1-ethenyl-6-fluoro-7-(4-methylpiperazin-1-yl)-4-oxo-1,8-naphthyridine-3-carboxylic acid

1-乙基-6-氟-4-氧代-7-(3-氧代-1-哌嗪基)-1,4-二氢-1,8-萘啶-3-羧酸

7-chloro-1-ethyl-6-fluoro-4-oxo-1,8-naphthyridine-3-carboxylic acid