2-(Hydroxymethyl)phenylboronic acid, dehydrate2-(Hydroxymethyl)benzeneboronic acid dehydrate 98%1,3-Dihydro-1-hydroxy-2,1-benzoxaborole2-(Hydroxymethyl)phenylboronic acid hemiester2-(羟基甲基)苯硼酸半酯2-(羟甲基)苯硼酸环状单酯2-(Hydroxymethyl)phenylboronic acid cyclic monoester1-Hydroxy-2,1-benzoxaborolane2-(Hydroxymethyl)benzeneboronic acid hemiester1-HYDROXY-2,1-BENZOXABOROLANE2-(羟基甲基)苯硼酸 半酯