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

MedKoo CAT#: 531352

CAS#: 556835-30-4

Description: A-349821 is an H3 receptor agonist radioligand.

Price and Availability




A-349821 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#: 531352
Name: A-349821
CAS#: 556835-30-4
Chemical Formula: C14H24O8
Exact Mass: 320.1471
Molecular Weight: 320.338
Elemental Analysis: C, 52.49; H, 7.55; O, 39.96

Synonym: A-349821

IUPAC/Chemical Name: (1,5-diacetyloxy-3,4-dimethoxyhexan-2-yl) acetate


InChi Code: InChI=1S/C14H24O8/c1-8(21-10(3)16)13(18-5)14(19-6)12(22-11(4)17)7-20-9(2)15/h8,12-14H,7H2,1-6H3


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: Miller TR, Milicic I, Bauch J, Du J, Surber B, Browman KE, Marsh K, Cowart M, Brioni JD, Esbenshade TA. Use of the H3 receptor antagonist radioligand [3H]-A-349821 to reveal in vivo receptor occupancy of cognition enhancing H3 receptor antagonists. Br J Pharmacol. 2009 May;157(1):139-49. doi: 10.1111/j.1476-5381.2009.00239.x. PubMed PMID: 19413577; PubMed Central PMCID: PMC2697797.

2: Witte DG, Yao BB, Miller TR, Carr TL, Cassar S, Sharma R, Faghih R, Surber BW, Esbenshade TA, Hancock AA, Krueger KM. Detection of multiple H3 receptor affinity states utilizing [3H]A-349821, a novel, selective, non-imidazole histamine H3 receptor inverse agonist radioligand. Br J Pharmacol. 2006 Jul;148(5):657-70. PubMed PMID: 16715122; PubMed Central PMCID: PMC1751875.

3: Esbenshade TA, Yao BB, Witte DG, Carr TL, Sharma R, Baranowski JL, Krueger KM, Miller TR, Surber BW, Faghih R, Hancock AA. Use of novel, non-imidazole inverse agonist radioligands to define histamine H3 receptor pharmacology. Inflamm Res. 2005 Apr;54 Suppl 1:S46-7. PubMed PMID: 15928830.

4: 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.

5: Esbenshade TA, Fox GB, Krueger KM, Baranowski JL, Miller TR, Kang CH, Denny LI, Witte DG, Yao BB, Pan JB, Faghih R, Bennani YL, Williams M, Hancock AA. Pharmacological and behavioral properties of A-349821, a selective and potent human histamine H3 receptor antagonist. Biochem Pharmacol. 2004 Sep 1;68(5):933-45. PubMed PMID: 15294456.

6: Faghih R, Dwight W, Pan JB, Fox GB, Krueger KM, Esbenshade TA, McVey JM, Marsh K, Bennani YL, Hancock AA. Synthesis and SAR of aminoalkoxy-biaryl-4-carboxamides: novel and selective histamine H3 receptor antagonists. Bioorg Med Chem Lett. 2003 Apr 7;13(7):1325-8. PubMed PMID: 12657274.