Clinical data
ATC code None
CAS Number 469887-29-4
PubChem (CID) 46782577
ChemSpider 35517741
ECHA InfoCard 100.230.712
Chemical and physical data
Formula C31H43NO10
Molar mass 589.674 g/mol
3D model (Jmol) Interactive image

Norbuprenorphine-3-glucuronide (N3G) is a major active metabolite of the opioid modulator buprenorphine.[1] It has affinity for the κ-opioid receptor (Ki = 300 nM) and the nociceptin receptor (Ki = 18 μM), but not for the μ- or δ-opioid receptors.[1] Whether N3G acts as an agonist or antagonist of each of the former two respective sites has yet to be determined.[2] In animals, N3G has been found to produce sedation, decreased locomotion, and a small amount of antinociception, properties which are consistent with the effects of κ-opioid receptor agonists.[1] In addition, N3G has been found to reduce tidal volume but not respiratory rate.[1] Unlike norbuprenorphine, but similarly to buprenorphine and buprenorphine-3-glucuronide, N3G is not a substrate for P-glycoprotein.[2] However, due to its highly hydrophilic nature, N3G nonetheless passes the blood-brain-barrier in only very small amounts.[2]

See also


  1. 1 2 3 4 Brown SM, Holtzman M, Kim T, Kharasch ED (December 2011). "Buprenorphine metabolites, buprenorphine-3-glucuronide and norbuprenorphine-3-glucuronide, are biologically active". Anesthesiology. 115 (6): 1251–60. doi:10.1097/ALN.0b013e318238fea0. PMC 3560935Freely accessible. PMID 22037640.
  2. 1 2 3 Brown SM, Campbell SD, Crafford A, Regina KJ, Holtzman MJ, Kharasch ED (October 2012). "P-glycoprotein is a major determinant of norbuprenorphine brain exposure and antinociception". J. Pharmacol. Exp. Ther. 343 (1): 53–61. doi:10.1124/jpet.112.193433. PMC 3464040Freely accessible. PMID 22739506.

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