2(1H)-Pyridinethione, 3-hydroxy- (8CI)(9CI) 2-Mercapto-3-hydroxypyridine 2-Mercaptopyridin-3-ol 23003-22-7 3-HYDROXY-2(1H)-PYRIDINETHIONE 3-Hydroxypyridine-2-thiol EINECS 245-375-3 NSC 283470