2,5-Dihydroxybenzoic acid
Also known as: Gentisic acid, DHB, 2,5-DHBA, 5-Hydroxysalicylic acid, Hydroquinonecarboxylic acid, Carboxyhydroquinone, Gensigen, Gensigon, Gentisate, Benzoic acid, 2,5-dihydroxy-, 2,5-dihydroxybenzoate, 2,5-dihydroxyphenylcarboxylic acid, 3,6-Dihydroxybenzoic Acid, Salicylic acid, 5-hydroxy-, Mesalazine Impurity G, Mesalamine Impurity G
2,5-Dihydroxybenzoic acid (CAS 490-79-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C7H6O4 and a molecular weight of 154.120 g/mol. Key properties include a melting point of 204-208 °C(lit.), a boiling point of 406.9±35.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 214.0±22.4 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. It is listed by 1 supplier, from 3.98 to 5.16 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 490-79-9
- Jingsj CID
- J-27781-5
- Molecular Formula
- C7H6O4
- Molecular Weight
- 154.120 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | 98% 500g | ¥1,990.00 | $0.6 /gBest ¥3.98/g CNY | CN China MOQ 500g | |
In Stock | 98% 100g | ¥450.00 | $0.67 /g ¥4.50/g CNY | CN China MOQ 100g | |
In Stock | 98% 25g | ¥129.00 | $0.77 /g ¥5.16/g CNY | CN China MOQ 25g |
Physicochemical Properties
| Melting Point | 204-208 °C(lit.) |
|---|---|
| Boiling Point | 406.9±35.0 °C at 760 mmHg |
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 214.0±22.4 °C |
| Exact Mass | 154.026611 |
| PSA | 77.76000 |
| LogP | 1.56 |
| Vapor Pressure | 0.0±1.0 mmHg at 25°C |
| Refractive Index | 1.671 |
| Additional Property | soluble |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Activity & Biological Data
| Target | Human Endogenous Metabolite Fibroblast growth factor |
|---|---|
| Additional Information | [1]. Levy G, et al. Salicylate accumulation kinetics in man. N Engl J Med. 1972 Aug 31;287(9):430-2. [2]. IS Fernández, et al. Gentisic acid, a compound associated with plant defense and a metabolite of aspirin, heads a new class of in vivo fibroblast growth factor inhibitors. Journal of Biological Chemistry , 2010, 285(15):11714-29. |
Customs & Trade Information
| HS Code | 2918290000 |
|---|---|
| Summary | HS: 2918290000 other carboxylic acids with phenol function but without other oxygen function, their anhydrides, halides, peroxides, peroxyacids and their derivatives Tax rebate rate:9.0% Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward) VAT:17.0% MFN tariff:6.5% General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 2,5-Dihydroxybenzoic acid?
The CAS number of 2,5-Dihydroxybenzoic acid is 490-79-9.
What are the molecular formula and molecular weight of 2,5-Dihydroxybenzoic acid?
2,5-Dihydroxybenzoic acid has molecular formula C7H6O4 and molecular weight 154.120 g/mol.
Which suppliers offer 2,5-Dihydroxybenzoic acid?
1 supplier(s) listed; reference unit price ¥3.98–5.16 /g.
Is 2,5-Dihydroxybenzoic acid hazardous?
2,5-Dihydroxybenzoic acid has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 2,5-Dihydroxybenzoic acid?
For 2,5-Dihydroxybenzoic acid, Upstream Products: 2,5-Dichlorobenzoic acid, 5-Bromosalicylic acid, Hydroquinone; Downstream Products: Methyl 2,4-dimethoxybenzoate, Methyl 2-methoxybenzoate, Methyl 3-methoxybenzoate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,5-Dihydroxybenzoic acid (CAS 490-79-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-27781-5 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.