6-甲基-2-氧代-2H-吡喃-5-羧酸甲酯

ethyl 6-oxopyran-3-carboxylate

methyl 6-methyl-3-oxohept-6-enoate

5- 氨基-3-甲基噻吩-2- 羧酸甲酯

2-乙基己基乙酰乙酸酯