4-Carboxy-1,2-dihydroxybenzene, protocatechuate, Benzoic acid,3,4-dihydroxy, protocatechuic acid, 3,4-dihydroxy-benzoic acid, 3,4-dihydroxybenzoate, Protocatehuic acid, Benzoic acid, 3,4-dihydroxy-, protochatechuic acid, 4,5-Dihydroxybenzoic acid, 3,4-Dihydroxybenzoic acid
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