1,2-Benzenediol; Pyrocatechol; 1,2-Dihydroxybenzene; 2-Hydroxyphenol; Oxyphenic Acid; Phthalhydroquinone; Phthalic Alcohol; Pyrocatechin; o-Benzenediol; o-Dihydroxybenzene; o-Dioxybenzene; o-Hydroquinone; o-Hydroxyphenol; o-Phenylenediol