3-nitro-6H-indolo[3,2-b]quinoxaline

2,3-dioxoindole-1-carbaldehyde

diethyl 2-(2-oxo-1H-indol-3-ylidene)propanedioate

2-(2-甲基苯基)喹啉-4-羧酸

2-(萘-2-基)喹啉-4-羧酸