Molekula
3,4-Dihydroxybenzoic acid
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
3,4-Dihydroxybenzoic acid is a phenolic compound used in pharmaceuticals, cosmetics, and as a chemical intermediate. In the laboratory, it serves as a matrix compound for MALDI mass spectrometry of synthetic polymers and as an analytical reagent. It appears as a white to pale yellow crystalline powder. CAS: 99-50-3, Molecular Formula: C7H6O4, Molecular Weight: 154.12 g/mol, Storage: Ambient, Signal Word: Warning. Molekula supplies 3,4-Dihydroxybenzoic acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
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100 g — £39.50 per pack ex VAT · £47.40 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White-like powder |
| Melting Point | 202.0 - 207.0°C |
| Loss on Drying | ≤1.0% |
| Assay (HPLC) | ≥99.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 221 °C |
| Vapour Pressure | 0.0000021 mmHg |
| pKa | pKa = 4.26 (at 25 °C) |
Source: PubChem CID 72 (Human Metabolome Database (HMDB), Haz-Map, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 90028656 |
| CAS Number | 99-50-3 |
| IUPAC Name | 3,4-dihydroxybenzoic acid |
| EC Number | 202-760-0 |
| Molecular Formula | (HO)2C6H3CO2H |
| Molecular Weight | 154.12 |
| Exact Mass | 154.0266 |
| SMILES | C1=CC(=C(C=C1C(=O)O)O)O |
| InChIKey | YQUVCSBJEUQKSH-UHFFFAOYSA-N |
| InChI | InChI=1S/C7H6O4/c8-5-2-1-4(7(10)11)3-6(5)9/h1-3,8-9H,(H,10,11) |
| PubChem CID | 72 |
| REACH Code | Y113 |
| HTS Code | 2918993000 |
| Tariff Code | 2918999090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1ykp
- 4-Carboxy-1,2-dihydroxybenzene
- 4,5-Dihydroxybenzoic acid
- Benzoic acid, 3,4-dihydroxy-
- Carbohydroquinonic acid
- Catechol-4-carboxylic Acid
- FEMA NO. 4430
- protocatechuate
- protocatechuic acid
- Protocatehuic acid
Frequently asked questions
What is 3,4-Dihydroxybenzoic acid used for?
It is used as a chemical intermediate in the synthesis of pharmaceuticals and antioxidants, and as a standard in analytical chemistry.
What is the chemical formula and molecular weight?
The formula is (HO)2C6H3CO2H and the molecular weight is 154.12 g/mol.
How should 3,4-Dihydroxybenzoic acid be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade is available?
Available in analytical grade; other grades may be available upon request.
Can Molekula supply it in bulk?
Yes, bulk quantities are available—please contact our sales team for pricing and availability.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation can be provided upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.