BQ-123

Also known as: BQ-123 SODIUM SALT, BQ-123 SYNTHETIC >99% SELECTIVE ETA ENDO THE, C(DTRP-DASP-PRO-DVAL-LEU), CYCLO (D-ALPHA-ASPARTYL-L-PROLYL-D-VALYL-L-LEUCYL-D-TRYPTOPHYL), CYCLO(D-ASP-PRO-D-VAL-LEU-D-TRP), Cyclo(L-α-aspartyl-L-prolyl-D-valyl-L-leucyl-D-tryptophyl), ETA-RECEPTOR ANTAGONIST, MFCD00133204, bq-123, bq-518, cyclo(Trp-Asp-Pro-Val-Leu), d-trp-d-asp-pro-d-val-leu, m.w. 610.70 c31h42n6o7

BQ-123 (CAS 136553-81-6) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C31H42N6O7 and a molecular weight of 610.701 g/mol. Key properties include a boiling point of 1053.6±65.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 591.0±34.3 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 136553-81-6
Jingsj CID: J-30969-3
Molecular Formula: C₃₁H₄₂N₆O₇
Molecular Weight: 610.701 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	1053.6±65.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	591.0±34.3 °C
Exact Mass	610.311523
PSA	189.80000
LogP	-0.10
Vapor Pressure	0.0±0.3 mmHg at 25°C
Refractive Index	1.621

Activity & Biological Data

Additional Information	[1]. Olgun NS et al. BQ-123 prevents LPS-induced preterm birth in mice via the induction of uterine and placental IL-10. Toxicol Appl Pharmacol, 2015 Feb 1;282(3):275-84. [2]. Kanashiro A et al. Cytokines, but not corticotropin-releasing factor and endothelin-1, participate centrally in the febrile response in zymosan-induced arthritis in rats. Brain Res, 2015 Jun 12, 1610:12-9. [3]. Erdogan H et al. The protective effects of endothelin-A receptor antagonist BQ-123 in pentylenetetrazole-induced seizure in rats. Hum Exp Toxicol, 2014 Oct, 33(10):1008-16.

Additional Information

[1]. Olgun NS et al. BQ-123 prevents LPS-induced preterm birth in mice via the induction of uterine and placental IL-10. Toxicol Appl Pharmacol, 2015 Feb 1;282(3):275-84. [2]. Kanashiro A et al. Cytokines, but not corticotropin-releasing factor and endothelin-1, participate centrally in the febrile response in zymosan-induced arthritis in rats. Brain Res, 2015 Jun 12, 1610:12-9. [3]. Erdogan H et al. The protective effects of endothelin-A receptor antagonist BQ-123 in pentylenetetrazole-induced seizure in rats. Hum Exp Toxicol, 2014 Oct, 33(10):1008-16.

Frequently Asked Questions

What is the CAS number of BQ-123?

The CAS number of BQ-123 is 136553-81-6.

What are the molecular formula and molecular weight of BQ-123?

BQ-123 has molecular formula C31H42N6O7 and molecular weight 610.701 g/mol.

What are the upstream and downstream products of BQ-123?

For BQ-123, Upstream Products: Boc-L-leucine hydrate, N-(tert-Butoxycarbonyl)-D-valine, N-[(tert-Butoxy)carbonyl]-D-tryptophan.

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. "BQ-123 (CAS 136553-81-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-30969-3 (accessed 2026-11-09).

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