Thymoquinone
Also known as: 2-methyl-5-propan-2-ylcyclohexa-2,5-diene-1,4-dione, 2-isopropyl-5-methyl-1,4-benzoquinone, 5-isopropyl-2-methyl-1,4-benzoquinone, p-mentha-3,6-diene-2,5-dione, thymolquinone, p-cymene-2,5-dione, 2-methyl-5-isopropyl-1,4-benzoquinone
Thymoquinone (CAS 490-91-5) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C10H12O2 and a molecular weight of 164.201 g/mol. Key properties include a melting point of 167 ºC, a boiling point of 232.0±15.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 103.9±0.0 °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. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 490-91-5
- Jingsj CID
- J-31108-3
- Molecular Formula
- C10H12O2
- Molecular Weight
- 164.201 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 167 ºC |
|---|---|
| Boiling Point | 232.0±15.0 °C at 760 mmHg |
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 103.9±0.0 °C |
| Exact Mass | 164.083725 |
| PSA | 34.14000 |
| LogP | 2.33 |
| Vapor Pressure | 0.1±0.5 mmHg at 25°C |
| Refractive Index | 1.505 |
| Additional Property | Very slightly soluble (0.82 g/L) (25 ºC) |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Activity & Biological Data
| Additional Information | [1]. Khader M, et al. Thymoquinone: an emerging natural drug with a wide range of medical applications. Iran J Basic Med Sci. 2014 Dec;17(12):950-7. |
|---|
Customs & Trade Information
| HS Code | 2914690090 |
|---|---|
| Summary | 2914690090 other quinones。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Thymoquinone?
The CAS number of Thymoquinone is 490-91-5.
What are the molecular formula and molecular weight of Thymoquinone?
Thymoquinone has molecular formula C10H12O2 and molecular weight 164.201 g/mol.
Is Thymoquinone hazardous?
Thymoquinone 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 Thymoquinone?
For Thymoquinone, Upstream Products: Carvacrol, Thymol, 4-amino-2-isopropyl-5-methylphenol; Downstream Products: Thymol, 2,5-Dibromo-3-isopropyl-6-methylbenzoquinone, Thymohydroquinone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Thymoquinone (CAS 490-91-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-31108-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.