(2,3,4-Trimethoxyphenyl)boronic acid2,3,4-Trimethoxybenzeneboronic acid2,3,4-Trimethoxyphenylboronic acid2,3,4-三甲氧基苯硼酸2,3,4-Trimethoxyphenylboronic acid2,3,4-Trimethoxybenzeneboronic acid2,3,4-Trimethoxyphenylboronic acid2,3,4-Trimethoxybenzeneboronic acid