trans-γ-acetoxytiglic aldehyde dimethyl acetal

methyl 4,4-dimethoxy-3-methyl-2-butenoate

(E)-4,4-Dimethoxy-3-methyl-crotonsaeureaethylester

4,4-二甲氧基-3-甲基-2-丁烯酸乙酯

(E)-3-甲酰基丁-2-烯基乙酸酯