3-Hydroxypyridine 1-oxide 3-Hydroxypyridine N-oxide 3-Hydroxypyridine-1-oxide 3-Hydroxypyridine-N-oxide 3-PYRIDINOL, 1-OXIDE 3-Pyridinol N-oxide 5-21-02-00076 (Beilstein Handbook Reference) 6602-28-4 BRN 0107683 EINECS 229-545-4 NSC 21399 Pyridin-3-ol 1-oxide