methyl 8,8-dimethoxy-1,5-dimethyl-3-oxo-2-oxabicyclo[2.2.2]oct-5-ene-6-carboxylate

2-溴-5-甲氧基-1,3-二甲苯

氯甲酸甲酯

4,6-二甲基阔马酸甲酯

1,1-二甲氧基乙烯