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