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3-Hydroxypiperidine hydrochloride

4-Hydroxypiperidine

3-Hydroxypiperidine

6-Hydroxypicolinic acid

5-Hydroxypicolinic acid

3-Hydroxypicolinic acid

4-Hydroxyphthalonitrile

N-Hydroxyphthalimide

4-Hydroxyphthalic acid

Hydroxyphosphono-acetic acid