(5-Chloro-2-hydroxy-phenyl)-(3-hydroxy-pyridin-2-yl)-methanone O-tert-butyl-oxime
(4,5-Dichloro-2-hydroxy-phenyl)-(3-hydroxy-pyridin-2-yl)-methanone O-tert-butyl-oxime
(Z)-2-[5-bromo-α-(tert-butoxyimino)-2-hydroxybenzyl]-3-hydroxypyridine
2-(2-hydroxy-5-methylbenzoyl)-3-hydroxypyridine