3,4-Dimethoxyphenylboronic acid3,4-Dimethoxybenzeneboronic acid3,4-Dimethoxyphenylboronic acid(3,4-dimethoxyphenyl)boronic acid3,4-Dimethoxybenzene boronic acid3,4-二甲氧基苯硼酸(3,4-dimethoxyphenyl)boranediol3,4-Dimethoxyphenylboronic acid3,4-Dimethoxybenzeneboronic acid