4-hydroxy-1-methyl-N-(4-methylphenyl)-2-oxoquinoline-3-carboxamide

ethyl 5-methyl-3,4-dioxothieno[3,2-c]quinoline-2-carboxylate

1,2-二氢-4-羟基-1-甲基-2-氧代-3-喹啉羧酸