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CAS Number
PubChem CID
Chemical and physical data
Molar mass422.558 g·mol−1
3D model (JSmol)
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A-349,821 is a potent and selective histamine H3 receptor antagonist[1] (or possibly an inverse agonist).[2] It has nootropic effects in animal studies,[3] although there do not appear to be any plans for clinical development at present and it is currently only used in laboratory research.

See also


  1. ^ Faghih, R; Dwight, W; Pan, JB; Fox, GB; Krueger, KM; Esbenshade, TA; McVey, JM; Marsh, K; Bennani, YL; Hancock, AA (2003). "Synthesis and SAR of aminoalkoxy-biaryl-4-carboxamides: novel and selective histamine H3 receptor antagonists". Bioorganic & Medicinal Chemistry Letters. 13 (7): 1325–8. doi:10.1016/S0960-894X(03)00118-5. PMID 12657274.
  2. ^ Witte, DG; Yao, BB; Miller, TR; Carr, TL; Cassar, S; Sharma, R; Faghih, R; Surber, BW; Esbenshade, TA; Hancock, AA; Krueger, KM (2006). "Detection of multiple H3 receptor affinity states utilizing 3HA-349821, a novel, selective, non-imidazole histamine H3 receptor inverse agonist radioligand". British Journal of Pharmacology. 148 (5): 657–70. doi:10.1038/sj.bjp.0706752. PMC 1751875. PMID 16715122.
  3. ^ Esbenshade, T. A.; Fox, G. B.; Krueger, K. M.; Baranowski, J. L.; Miller, T. R.; Kang, C. H.; Denny, L. I.; Witte, D. G.; Yao, B. B.; Pan, J. B.; Faghih, R.; Bennani, Y. L.; Williams, M.; Hancock, A. A. (2004). "Pharmacological and behavioral properties of A-349821, a selective and potent human histamine H3 receptor antagonist". Biochemical Pharmacology. 68 (5): 933–945. doi:10.1016/j.bcp.2004.05.048. PMID 15294456.