DL-Pyroglutamic acid
Also known as: 2-Pyrrolidone-5-carboxylic acid, 5-Oxopyrrolidine-2-carboxylic acid, (+/-)-2-Pyrrolidinone-5-carboxylic acid, (+/-)-2-Pyrrolidone-5-carboxylic acid, 5-Oxo-DL-proline, DL-5-Oxo-2-pyrrolidinecarboxylic acid, DL-2-Pyrrolidinone-5-carboxylic acid, DL-5-Pyrrolidone-2-carboxylic acid, DL-Glutamic acid lactam, DL-Pyroglutamic, H-DL-Pyr-OH, Pyrrolidonecarboxylic acid
DL-Pyroglutamic acid (CAS 149-87-1) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H7NO3 and a molecular weight of 129.114 g/mol. Key properties include a melting point of 180-185ºC, a boiling point of 453.1±38.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 227.8±26.8 °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.
- 149-87-1
- Jingsj CID
- J-39682-7
- Molecular Formula
- C5H7NO3
- Molecular Weight
- 129.114 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 180-185ºC |
|---|---|
| Boiling Point | 453.1±38.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 227.8±26.8 °C |
| Exact Mass | 129.042587 |
| PSA | 66.40000 |
| LogP | -2.39 |
| Vapor Pressure | 0.0±2.4 mmHg at 25°C |
| Refractive Index | 1.512 |
| Additional Property | 5.67 g/100 mL (20 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]. Sugimoto Y, et al. N-alpha-Cocoyl-L-arginine ethyl ester, DL-pyroglutamic acid salt, as an inactivator of hepatitis B surface antigen. Antimicrob Agents Chemother. 1979 Sep;16(3):329-32. |
|---|
Customs & Trade Information
| HS Code | 2933790090 |
|---|---|
| Summary | 2933790090. other lactams. VAT:17.0%. Tax rebate rate:9.0%. . MFN tariff:9.0%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of DL-Pyroglutamic acid?
The CAS number of DL-Pyroglutamic acid is 149-87-1.
What are the molecular formula and molecular weight of DL-Pyroglutamic acid?
DL-Pyroglutamic acid has molecular formula C5H7NO3 and molecular weight 129.114 g/mol.
Is DL-Pyroglutamic acid hazardous?
DL-Pyroglutamic 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 DL-Pyroglutamic acid?
For DL-Pyroglutamic acid, Upstream Products: L-Glutamic acid, Folic Acid, DL-Glutamic acid; Downstream Products: n-Octyl L-2-pyrrolidone-5-carboxylate, Pyrrolidin-2-ylmethanol, Methyl L-pyroglutamate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "DL-Pyroglutamic acid (CAS 149-87-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-39682-7 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.