4-(2,5-二甲氧基苯基)丁酸

1-ethenyl-3,6-dimethoxybenzocyclobuten-1-ol

3-(2,5-二甲氧基苯甲酰)丙酸

对苯二甲醚

4-(2,5-dimethoxyphenyl)but-3-enoic acid