1621-90-5 4-Hydroxyaminopyridine 1-oxide 4-Pyridinamine, N-hydroxy-, 1-oxide (9CI) 5-22-14-00470 (Beilstein Handbook Reference) BRN 0472267 N-Hydroxy-4-pyridinamine 1-oxide Pyridine, 4-hydroxyamino-, 1-oxide