4-Carboxy-3-fluorobenzeneboronic acid, pinacol ester 98%2-Fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoic acid4-羧基-3-氟苯硼酸频哪酯4-Carboxy-3-fluorophenylboronic acid pinacol ester2-Fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoic acid4-Carboxy-3-fluorobenzeneboronic acid pinacol ester