5-Hydroxy-2-(3-hydroxy-4, 5-dimethoxyphenyl)-6, 7-dimethoxychromen-4-one

5-Hydroxy-2-(4-methoxyphenyl)-4H-chromen-4-one

5-Hydroxy-2-(hydroxymethyl)-4(1H)-pyridinone

5-Hydroxy-2-amino-3-methylimidazo(4, 5-f)quinoline

5-Hydroxy-2-aminobenzimidazole

5-Hydroxy-2-aminotetralin

5-Hydroxy-2-benzyl-1, 3-dioxane

5-Hydroxy-2-dodecenoic acid delta-lactone

5-Hydroxy-2-ethylhexanoic acid

5-Hydroxy-2-hexanone

5-Hydroxy-2-hydroxymethyl-1-methylpyrid-4-one

5-Hydroxy-2-imino-7-methyl-1, 2-dihydropyrazolo(1, 5-a)pyridine-3, 4-dicarbonitrile

5-Hydroxy-2-iodotyrosine

5-Hydroxy-2-methyl-1, 3-dioxane-4-carbaldehyde

5-Hydroxy-2-methyl-2-(di-n-propylamino)tetralin

5-Hydroxy-2-methylbenzenesulfonic acid

5-Hydroxy-2-methylpyridine 1-oxide

5-Hydroxy-2-N, N-dipropylaminotetralin

5-Hydroxy-2-nitrobenzaldehyde

5-Hydroxy-2-nitrofluorene