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6-Hydroxynaphthalene-2-sulphonic acid

5-Hydroxy-1-naphthalenesulfonic acid sodium salt

3-Hydroxynaphthalene-2,7-disulphonic acid

7-Hydroxynaphthalene-1,3-disulfonic acid

2-Hydroxy-1-naphthaldehyde

6-Hydroxy-2-naphthaldehyde

2-Hydroxy-1,4-naphoquinone

(Hydroxymethyl)urea

5-Hydroxymethyluracil

3-Hydroxy-alpha-methyl-DL-tyrosine