4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine181219-01-230 % similar 4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)toluene195062-57-830 % similar Pyrimidine-5-boronic acid pinacol ester321724-19-030 % similar