1,2,3,6-四氢-1,1-二甲基-氮杂[4,5-B]吲哚-5-羧酸乙酯

ethyl 6-methoxyimidazo[1,2-b]pyridazine-2-carboxylate

2-苯基噁唑-4-羧酸乙酯

Ethyl 2-(hydroxymethyl)thiazole-4-carboxylate

ethyl 2-(2-aminoethyl)-1,3-thiazole-4-carboxylate