6-溴4-氮杂-吲哚-2-酮

1H-吡唑并[4,3-b]吡啶-6-羧酸

ethyl 1H-pyrazolo[4,3-b]pyridine-6-carboxylate

(5-溴-3-硝基吡啶-2-基)乙酸乙酯