Quinapril diketopiperazine

Also known as: Quinapril USPRC A, Quinapril EP Impurity D, Quinapril impurity I, PD 109488, Quinapril Related Compound A, ethyl (2S)-2-[(3S,11aS)-3-methyl-1,4-dioxo-3,6,11,11a-tetrahydropyrazino[1,2-b]isoquinolin-2-yl]-4-phenylbutanoate

Quinapril diketopiperazine (CAS 103733-49-9) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C25H28N2O4 and a molecular weight of 420.50 g/mol. Key properties include a boiling point of 644.5ºC at 760 mmHg, a density of 1.25g/cm3 and a flash point of 343.6ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 103733-49-9
Jingsj CID: J-1982945-9
Molecular Formula: C₂₅H₂₈N₂O₄
Molecular Weight: 420.50 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	644.5ºC at 760 mmHg
Density	1.25g/cm3
Flash Point	343.6ºC
Exact Mass	420.20500
PSA	66.92000
LogP	2.61090
Vapor Pressure	1.68E-16mmHg at 25°C
Refractive Index	1.617

Activity & Biological Data

Additional Information	[1]. A R Kugler, et al. Determination of quinapril and quinaprilat by high-performance liquid chromatography with radiochemical detection, coupled to liquid scintillation counting spectrometry. J Chromatogr B Biomed Appl. 1995 Apr 21;666(2):360-7.

Frequently Asked Questions

What is the CAS number of Quinapril diketopiperazine?

The CAS number of Quinapril diketopiperazine is 103733-49-9.

What are the molecular formula and molecular weight of Quinapril diketopiperazine?

Quinapril diketopiperazine has molecular formula C25H28N2O4 and molecular weight 420.50 g/mol.

What are the upstream and downstream products of Quinapril diketopiperazine?

For Quinapril diketopiperazine, Upstream Products: Quinapril, (3S)-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, tert-Butyl (S)-1,2,3,4-tetrahydroisoquinoline-3-carboxylate hydrochloride.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Quinapril diketopiperazine (CAS 103733-49-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1982945-9 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.