protocatechuic acid; Protocatehuic acid; 4-Carboxy-1,2-dihydroxybenzene; protocatechuate; Benzoic acid, 3,4-dihydroxy-; 4,5-Dihydroxybenzoic acid; MFCD00002509; 3,4-Dihydroxybenzoicacid; UNII-36R5QJ8L4B; Catechol-4-carboxylic Acid; CCRIS 6291; CHEMBL37537; MLS000737807; 36R5QJ8L4B; EINECS 202-760-0; NSC 16631; 3, 4-Dihydroxybenzoic acid; BRN 1448841; 3,4-dihydroxybenzoic acid (protocatechuic acid); Protocatechuic acid polymer; 3,4-Dihydroxybenzoic acid, 97%; 3,4-Dihydroxy Benzoic Acid; NSC16631; Benzoic acid, 3,4-dihydroxy- (9CI); DB03946; SMR000528167; C00230; D-3487; Hypogallic acid; b-Resorcylate; beta-Resorcylate; Protacatechuic Acid; ZINCSELENITE; Carbohydroquinonic acid; cid_72; ACMC-209scu; Protocatechuic Acid,(S); DSSTox_CID_1212; Protocatechuic acid (M1); bmse000328; 3,4-dihydroxy-benzoic acid; DSSTox_RID_76012; DSSTox_GSID_21212; SCHEMBL39435; KSC486M3D; 3,4-Dihydroxybenzoate, VIII; Pyrocatechol-4-carboxylic Acid; DTXSID4021212; CTK3I6631; KS-00000COI; ZINC13246; HMS2270A17; KUC104409N; ACN-S002778; ACT07872; HY-N0294; Tox21_200167; ANW-41020; BBL012232; BDBM50100861; CP0105; NSC-16631; s3975; SBB061371; STL163570; AKOS000119632; AC-9617; CCG-207950; CS-6092; KSC-10-128; MCULE-8964889860; Oxidative polymer of protocatechuic acid; NCGC00246757-01; NCGC00246757-02; NCGC00257721-01; AK-47644; AS-10808; BR-47644; SC-46684; SY014104; AB0008267; DB-021903; AM20060767; FT-0600028; N2466; ST50824448; 3,4-Dihydroxybenzoic acid, >=97.0% (T); 3,4-Dihydroxybenzoic acid, analytical standard; M-3133; 002D509; AE-562/40524392; Q418599; 976C8CCE-B25D-4E0A-9A6F-3CEEA7A6964F; 3,4-Dihydroxybenzoic acid, Vetec(TM) reagent grade, 97%; Protocatechuic acid, primary pharmaceutical reference standard; Protocatechuic acid, United States Pharmacopeia (USP) Reference Standard