diethyl 2-nitrobutanedioate

4-乙酰基-4,5-二氢-2(3H)-呋喃酮

7-苯胺基-4-甲基香豆素-3-乙酸

(7-甲氧基-4-甲基-2-氧代-2H-苯并吡喃-3-基)乙酸

ethyl 5-methyl-2-oxo-1-pentyl-3H-pyrrole-4-carboxylate