WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 555208

CAS#: 1027330-82-0 (free base)

Description: A-940894 is a potent histamine H4 receptor antagonist with anti-inflammatory properties. A-940894 potently binds to both human and rat histamine H4 receptors and exhibits considerably lower affinity for the human histamine H1, H2 or H3 receptors. It potently blocked histamine-evoked calcium mobilization in the fluorometric imaging plate reader assays and inhibited histamine-induced shape change of mouse bone marrow-derived mast cells and chemotaxis of human eosinophils in vitro. A-940894 has good pharmacokinetic properties, including half-life and oral bioavailability in rats and mice.

Chemical Structure

CAS# 1027330-82-0 (free base)

Theoretical Analysis

MedKoo Cat#: 555208
Name: A-940894
CAS#: 1027330-82-0 (free base)
Chemical Formula: C17H21N5
Exact Mass: 295.1797
Molecular Weight: 295.39
Elemental Analysis: C, 69.12; H, 7.17; N, 23.71

Price and Availability

This product is not in stock, which may be available by custom synthesis. For cost-effective reason, minimum order is 1g (price is usually high, lead time is 2~3 months, depending on the technical challenge). Quote less than 1g will not be provided. To request quote, please email to sales @medkoo.com or click below button.
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Related CAS #: 1027330-82-0 (free base)   1072114-55-6 (maleate)    

Synonym: A-940894; A 940894; A940894.

IUPAC/Chemical Name: 4-piperazin-1-yl-6,7-dihydro-5H-benzo[6,7]cyclohepta[1,2-d]pyrimidin-2-ylamine


InChi Code: InChI=1S/C17H21N5/c18-17-20-15-13-6-2-1-4-12(13)5-3-7-14(15)16(21-17)22-10-8-19-9-11-22/h1-2,4,6,19H,3,5,7-11H2,(H2,18,20,21)


Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 295.39 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Strakhova MI, Cuff CA, Manelli AM, Carr TL, Witte DG, Baranowski JL, Vortherms
TA, Miller TR, Rundell L, McPherson MJ, Adair RM, Brito AA, Bettencourt BM, Yao
BB, Wetter JM, Marsh KC, Liu H, Cowart MD, Brioni JD, Esbenshade TA. In vitro and
in vivo characterization of A-940894: a potent histamine H4 receptor antagonist
with anti-inflammatory properties. Br J Pharmacol. 2009 May;157(1):44-54. doi:
10.1111/j.1476-5381.2009.00236.x. PubMed PMID: 19413570; PubMed Central PMCID:

Additional Information

A-940894 is a potent and selective histamine H4 receptor antagonist with pharmacokinetic properties suitable for long-term in vivo testing and could serve as a useful tool for the further characterization of histamine H4 receptor pharmacology.