2-氧代-2,3-二羟基噁唑-4-羧酸乙酯

ethyl 2-nitrosoprop-2-enoate

6,8-二溴咪唑并[1,2-a]吡嗪-2-羧酸乙酯

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

(9ci)-2-(2-甲基丙基)-4-噻唑羧酸乙酯