methyl 4-azido-3-methoxybut-2-enoate

methyl 4-methylsulfanyl-3-oxobutanoate

methyl 2-[(dimethylamino)methylene]-4-methoxy-3-oxobutanoate

4-氧代-3-苄氧基-4H-吡喃-2,5-二甲酸二甲酯; 度鲁特韦中间体 3