6-(1,4-Dioza-8-azaspiro[4.5]dec-8-yl)pyridine-3-boronicacid
6-(Diethylamino)pyridine-2-boronicacid
6-(4-Morpholinylmethyl)pyridine-3-boronicacid
6-Aminopyridine-2-boronicacid