1-(4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)pyrrolidine1-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]pyrrolidine4-(Pyrrolidin-1-yl)benzeneboronic acid, pinacol ester 97%1-[4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]pyrrolidine4-(1-Pyrrolidinyl)benzeneboronic acid pinacol ester