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

MedKoo CAT#: 531347

CAS#: 360551-71-9

Description: A-304121 is a histamine H(3) receptor.

Price and Availability




A-304121 is not in stock, may be available through custom synthesis. For cost-effective reason, minimum 1 gram order is requested. The product will be characterized by NMR, HPLC and MS analysis. Purity (HPLC) is usually >98%. CoA, QC data, MSDS will be provided when product is successfully made. The estimated lead time is 2-3 months. Please send email to sales@medkoo.com to inquire quote.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 531347
Name: A-304121
CAS#: 360551-71-9
Chemical Formula: C20H29N3O3
Exact Mass: 359.2209
Molecular Weight: 359.47
Elemental Analysis: C, 66.83; H, 8.13; N, 11.69; O, 13.35

Synonym: A-304121

IUPAC/Chemical Name: (2R)-2-amino-1-[4-[3-[4-(cyclopropanecarbonyl)phenoxy]propyl]piperazin-1-yl]propan-1-one


InChi Code: InChI=1S/C20H29N3O3/c1-15(21)20(25)23-12-10-22(11-13-23)9-2-14-26-18-7-5-17(6-8-18)19(24)16-3-4-16/h5-8,15-16H,2-4,9-14,21H2,1H3/t15-/m1/s1


Technical Data

Solid powder

>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).

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).

Harmonized System Code:


1: Pan JB, Yao BB, Miller TR, Kroeger PE, Bennani YL, Komater VA, Esbenshade TA, Hancock AA, Decker MW, Fox GB. Evidence for tolerance following repeated dosing in rats with ciproxifan, but not with A-304121. Life Sci. 2006 Aug 29;79(14):1366-79. PubMed PMID: 16730751.

2: Fox GB, Esbenshade TA, Pan JB, Radek RJ, Krueger KM, Yao BB, Browman KE, Buckley MJ, Ballard ME, Komater VA, Miner H, Zhang M, Faghih R, Rueter LE, Bitner RS, Drescher KU, Wetter J, Marsh K, Lemaire M, Porsolt RD, Bennani YL, Sullivan JP, Cowart MD, Decker MW, Hancock AA. Pharmacological properties of ABT-239 [4-(2-{2-[(2R)-2-Methylpyrrolidinyl]ethyl}-benzofuran-5-yl)benzonitrile]: II. Neurophysiological characterization and broad preclinical efficacy in cognition and schizophrenia of a potent and selective histamine H3 receptor antagonist. J Pharmacol Exp Ther. 2005 Apr;313(1):176-90. PubMed PMID: 15608077.

3: Yao BB, Sharma R, Cassar S, Esbenshade TA, Hancock AA. Cloning and pharmacological characterization of the monkey histamine H3 receptor. Eur J Pharmacol. 2003 Dec 15;482(1-3):49-60. PubMed PMID: 14660004.

4: Faghih R, Phelan K, Esbenshade TA, Miller TR, Kang CH, Krueger KM, Yao BB, Fox GB, Bennani YL, Hancock AA. D-alanine piperazine-amides: novel non-imidazole antagonists of the histamine H3 receptor. Inflamm Res. 2003 Apr;52 Suppl 1:S47-8. PubMed PMID: 12755406.

5: Yao BB, Witte DG, Miller TR, Krueger KM, Carr TL, Kang CH, Faghih R, Bennani YL, Esbenshade TA, Hancock AA. In vitro pharmacological properties of two novel non-imidazole H3 receptor (H3R) antagonists. Inflamm Res. 2003 Apr;52 Suppl 1:S45-6. PubMed PMID: 12755405.

6: Fox GB, Pan JB, Faghih R, Esbenshade TA, Lewis A, Bitner RS, Black LA, Bennani YL, Decker MW, Hancock AA. Identification of novel H3 receptor (H3R) antagonists with cognition enhancing properties in rats. Inflamm Res. 2003 Apr;52 Suppl 1:S31-2. PubMed PMID: 12755398.

7: Esbenshade TA, Krueger KM, Miller TR, Kang CH, Denny LI, Witte DG, Yao BB, Fox GB, Faghih R, Bennani YL, Williams M, Hancock AA. Two novel and selective nonimidazole histamine H3 receptor antagonists A-304121 and A-317920: I. In vitro pharmacological effects. J Pharmacol Exp Ther. 2003 Jun;305(3):887-96. PubMed PMID: 12606603.

8: Fox GB, Pan JB, Radek RJ, Lewis AM, Bitner RS, Esbenshade TA, Faghih R, Bennani YL, Williams M, Yao BB, Decker MW, Hancock AA. Two novel and selective nonimidazole H3 receptor antagonists A-304121 and A-317920: II. In vivo behavioral and neurophysiological characterization. J Pharmacol Exp Ther. 2003 Jun;305(3):897-908. PubMed PMID: 12606600.

9: Faghih R, Dwight W, Black L, Liu H, Gentles R, Phelan K, Esbenshade TA, Ireland L, Miller TR, Kang CH, Krueger KM, Fox GB, Hancock AA, Bennani YL. Structure-activity relationships of non-imidazole H(3) receptor ligands. Part 2: binding preference for D-amino acids motifs. Bioorg Med Chem Lett. 2002 Aug 5;12(15):2035-7. PubMed PMID: 12113836.