2,3,4-Trihydroxybenzene carboxylic acid 2,3,4-Trihydroxybenzoate 2,3,4-Trihydroxybenzoic acid 4-Pyrogallolcarboxylic acid 610-02-6 Benzoic acid, 2,3,4-trihydroxy- NSC27436 Pyrogallolcarboxylic acid