5-Formylpyridine-3-boronic acid pinacol ester5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)nicotinaldehyde5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine-3-carboxaldehyde5-Formylpyridine-3-boronic acid, pinacol ester3-Formyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine