2-bromo-7-ethyl-4-oxothieno[2,3-b]pyridine-5-carboxylic acid

4-羟基噻吩[2,3-b]吡啶-5-羧酸

7-乙基-4-氧代-4,7-二氢噻吩并[2,3-b]吡啶-5-羧酸

ethyl 2-bromo-7-ethyl-4-oxothieno[2,3-b]pyridine-5-carboxylate

乙基4-氯噻吩并[2,3-b]吡啶-5-羧酸酯