3,4-dihydroxybenzoic acid
This is the primary chemical detail page for 3,4-dihydroxybenzoic acid · CAS 99-50-3. The current molecular formula entry is C7H6O4. 110 searchable synonyms resolve back to this record. Use this page as the main reference for identifiers, naming variants, and supplier-linked context.
Overview
Key identifiers
- CAS No.
- 99-50-3
- Primary name
- 3,4-dihydroxybenzoic acid
- Formula
- C7H6O4
Record status
Added Apr 3, 2026 · Updated Apr 3, 2026
Properties
- Molecular formula
- C7H6O4
Safety
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About this chemical
This page represents the primary record for 3,4-dihydroxybenzoic acid with CAS Registry Number 99-50-3. The molecular formula is C7H6O4. This chemical may be referenced by 110 different names or synonyms.
Primary identifiers: English name · CAS · Molecular formula (when available). Synonym and alternate-name pages all resolve back to this record.
Synonyms and naming
Chemicals are often known by multiple names depending on context, industry, or language. This entry includes 110 searchable synonyms. Alternate-name landing pages, where present, all resolve back to this main record.
Use the synonym list below as naming context; keep this chemical detail page as the primary reference.
Synonyms
Common & readable names (96)
- protocatechuic acid
- 99-50-3
- 4-Carboxy-1,2-dihydroxybenzene
- Protocatehuic acid
- 4,5-Dihydroxybenzoic acid
- 36R5QJ8L4B
- DTXCID601212
- FEMA NO. 4430
- CHEBI:36062
- RefChem:25857
- 202-760-0
- protocatechuate
- Benzoic acid, 3,4-dihydroxy-
- 3,4-Dihydroxy Benzoic Acid
- protocatechuicacid
- CCRIS 6291
- 3,4-dihydroxy-benzoic acid
- CHEMBL37537
- MLS000737807
- EINECS 202-760-0
- Catechol-4-carboxylic Acid
- BRN 1448841
- 3,4-Dihydroxybenzoicacid
- 1ykp
- 3, 4-Dihydroxybenzoic acid
- DB03946
- SMR000528167
- b-Resorcylate
- beta-Resorcylate
- procatechuic acid
- ProtocatechicAcid
- b-resorcylic acid
- 4fht
- protoeatechuic acid
- protocatechulic acid
- cid_72
- 3,4-dihydrobenzonic acid
- PROTOCATECHOIC ACID
- Protocatechuic acid (M1)
- 3,4-dihodroxybenzoic acid
- bmse000328
- 3,4-dihydoxy benzoic acid
- SCHEMBL39435
- 3,4-Dihydroxybenzoate, VIII
- Protocatechuic acid (Standard)
- Pyrocatechol-4-carboxylic Acid
- orb1310493
- SCHEMBL2492579
- SCHEMBL6631285
- SCHEMBL6633467
- SCHEMBL6635343
- PROTOCATECHUIC ACID [MI]
- SCHEMBL29350008
- SCHEMBL29557106
- HY-N0294R
- PROTOCATECHUIC ACID (PCA)
- HMS2270A17
- HMS5082N09
- HY-N0294
- Tox21_200167
- BBL012232
- BDBM50100861
- DIHYDROXYBENZOIC ACID, 3,4-
- EBC-04042
- s3975
- STL163570
- AKOS000119632
- MSK70010-100M
- AC-9617
- CCG-207950
- CS-6092
- FD22102
- KSC-10-128
- 1,2-Dihydroxybenzene-4-carboxylic acid
- CAS-99-50-3
- NCGC00246757-01
- NCGC00246757-02
- NCGC00246757-04
- NCGC00257721-01
- AS-10808
- DB-021903
- ST50824448
- 3,4-Dihydroxybenzoic acid, >=97.0% (T)
- EN300-21544
- 3,4-Dihydroxybenzoic acid, analytical standard
- AE-562/40524392
- DROXIDOPA METABOLITE (PROTOCATECHOIC ACID)
- Q418599
- 976C8CCE-B25D-4E0A-9A6F-3CEEA7A6964F
- 3,4-Dihydroxybenzoicacid Solution in Methanol, 100ug/mL
- Z104501142
- 3,4-Dihydroxybenzoic acid, Vetec(TM) reagent grade, 97%
- Protocatechuic acid, primary pharmaceutical reference standard
- PROTOCATECHOIC ACID (CONSTITUENT OF MARITIME PINE) [DSC]
- Protocatechuic acid, United States Pharmacopeia (USP) Reference Standard
- 1225528-47-1
Registry & reference names (14)
- DTXSID4021212
- NSC-16631
- MFCD00002509
- NSC 16631
- NSC16631
- UNII-36R5QJ8L4B
- C00230
- KUC104409N
- SBB061371
- SY014104
- NS00014667
- F11285
- F043464
- InChI=1/C7H6O4/c8-5-2-1-4(7(10)11)3-6(5)9/h1-3,8-9H,(H,10,11