Synonyms: 3,4-dihydroxybenzoic acid; protocatechuic acid; Benzoic acid, 3,4-dihydroxy-; ST2417248; TR-032902; AM20060767; FT-0600028; N2466; ST50824448; 3,4-Dihydroxybenzoic acid, >=97.0% (T); 3,4-Dihydroxybenzoic acid, analytical standard; M-3133; MFCD00002509 (97+%); 4,5-Dihydroxybenzoic acid; 002D509; AE-562/40524392; I01-2896; 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; InChI=1/C7H6O4/c8-5-2-1-4(7(10)11)3-6(5)9/h1-3,8-9H,(H,10,11; 3,4-dihydroxybenzoate; b-resorcylic acid; 3,4-Dihydroxybenzoicacid; beta-Resorcylic acid; 2,4-dihydroxybenzoate; 3,4-dihydroxybenzoesyre; 3,4-dihydrobenzoic acid; 2,4-dihydroxybenzoic acid; Benzoic acid,4-dihydroxy-; C7H6O4; 3,4-Diacetoxy-benzoic acid; CID72; 3,4-DIACETOXY-BENZOICACID; UNII-36R5QJ8L4B; C7-H6-O4; protocatechuic acid, monosodium salt; AR-1E9213; c0055; ACN-035759; CS-O-31060; 3,4-Dihydroxybenzoic acid, 97% 25g; protocatechuic acid, carboxy-14C-labeled; Protocatechuic acid, 99% - 100G 100g; 4-10-00-01459 (Beilstein Handbook Reference); MFCD00002509; C009091; DHB; 58534-64-8; 6334-12-9; Pca; POP; CCRIS 6291; EINECS 202-760-0; NSC 16631; 3, 4-Dihydroxybenzoic acid; BRN 1448841; protocatechuic acid, carboxy-14C-labeled; CHEMBL37537; MLS000737807; 36R5QJ8L4B; CHEBI:36062; YQUVCSBJEUQKSH-UHFFFAOYSA-N; 1ykp; 3,4-dihydroxybenzoic acid (protocatechuic acid); Protocatechuic acid polymer; Catechol-4-carboxylic Acid; 3,4-Dihydroxybenzoic acid, 97%; protocatechuic acid, monosodium salt; NSC16631; 3,4-dihydroxybenzoes; Benzoic acid, 3,4-dihydroxy- (9CI); DB03946; SMR000528167; 3,4-Dihydroxy Benzoic Acid; C00230; D-3487; b-Resorcylate; beta-Resorcylate; 3,4-DIHYDROXYBENZOIC ACID; 4fht; protocatechuic-acid; Protacatechuic Acid; cid_72; ACMC-209scu; AC1Q5TRL; Protocatechuic Acid,(S); DSSTox_CID_1212; Protocatechuic acid (M1); bmse000328; protocatechuic acid; 3,4-dihydroxy-benzoic acid; DSSTox_RID_76012; DSSTox_GSID_21212; SCHEMBL39435; KSC486M3D; 3,4-Dihydroxybenzoate, VIII; Pyrocatechol-4-carboxylic Acid; AC1L18F1; AC1Q732Z; DTXSID4021212; 99-50-3; CTK3I6631; KS-00000COI; ZINC13246; HMS2270A17; KUC104409N; ACN-S002778; ACT07872; HY-N0294; Tox21_200167; ANW-41020; 4-Carboxy-1,2-dihydroxybenzene; BBL012232; BDBM50100861; CP0105; NSC-16631; SBB061371; STL163570; AKOS000119632; AC-9617; CCG-207950; CS-6092; Protocatehuic acid; KSC-10-128; LS-7685; MCULE-8964889860; RP21802; RTR-032902; TRA0078616; CAS-99-50-3; Oxidative polymer of protocatechuic acid; NCGC00246757-01; NCGC00246757-02; protocatechuate; NCGC00257721-01; AJ-08357; AK-47644; AS-10808; BR-47644; SC-46684; SY014104; AB0008267; AB1002236; DB-021903;