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2-(tert-Butyloxycarbonyl)pyrimidine-5-boronic acid pinacol ester tert-butyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidin-2-carboxylate tert-Butyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidine-2-carboxylate 2-Pyrimidinecarboxylic acid, 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-, 1,1-dimethylethyl ester