ethyl 5-methyl-2-(2-phenylethenyl)-1,3-oxazole-4-carboxylate

ethyl 2-cyclopentyl-5-methyl-1,3-oxazole-4-carboxylate

(9ci)-2,5-二甲基-1H-咪唑-4-羧酸乙酯

3,5-二甲基-4-硝基-1H-吡咯-2-羧酸乙酯

ethyl 2-(cyclohexanecarbonylamino)-3-oxobutanoate