Synonyms: Guaiacol Imp. A (EP), Benzene-1,2-diol, Pyrocatechol, 1,2-Benzenediol, 1,2-Dihydroxybenzene, 1,2-Hydroxybenzene, 2-Hydroxyphenol, C.I. 76500, C.I. Oxidation Base 26, Catechol, Catechol (phenol), Durafur Developer C, Fouramine PCH, Fourrine 68, NSC 1573, Oxyphenic acid, Pelagol Grey C, Phthalhydroquinone, Phthalic alcohol, Pyrocatechin, Pyrocatechine, Z 1, Z 1 (inhibitor), o-Benzenediol, o-Dihydroxybenzene, o-Dioxybenzene, o-Hydroquinone, o-Hydroxyphenol, o-Phenylenediol, Guaiacol Impurity A