ethyl 3-methyl-6-oxohexa-2,4-dienoate

3-甲酰基-2-丁烯酸乙酯

4,4-dimethoxy-3-methylbut-2-en-1-ol

ethyl 4-hydroxy-3-methylbut-2-enoate

(S)-(-)-ethyl 4-hydroxy-3-methylbutenoate