D-Pyroglutamic acid
Also known as: (R)-5-Oxopyrrolidine-2-carboxylic acid, 5-Oxo-D-proline, D-5-Oxoproline, H-D-Pyr-OH, D-Pyr-OH, (R)-(+)-2-Pyrrolidinone-5-carboxylic acid, D-(+)-Pyroglutamic acid, Pidolic acid (D-)
D-Pyroglutamic acid (CAS 4042-36-8) 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 155-162ºC, 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 H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 4042-36-8
- Jingsj CID
- J-10825-8
- 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 | 155-162ºC |
|---|---|
| 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 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
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 D-Pyroglutamic acid?
The CAS number of D-Pyroglutamic acid is 4042-36-8.
What are the molecular formula and molecular weight of D-Pyroglutamic acid?
D-Pyroglutamic acid has molecular formula C5H7NO3 and molecular weight 129.114 g/mol.
Is D-Pyroglutamic acid hazardous?
D-Pyroglutamic acid has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of D-Pyroglutamic acid?
For D-Pyroglutamic acid, Upstream Products: (R)-(-)-5-(Hydroxymethyl)-2-pyrrolidinone, Methyl (R)-(-)-2-pyrrolidinone-5-carboxylate, D(-)-Glutamic acid; Downstream Products: Fasoracetam, D(-)-Glutamic acid, (5R)-5-(bromomethyl)pyrrolidin-2-one.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "D-Pyroglutamic acid (CAS 4042-36-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-10825-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.