Norbuprenorphine-3-glucuronide

Norbuprenorphine-3-glucuronide
Clinical data
ATC code	None;
Identifiers
	IUPAC name (5β,7β)-7-[(2R)-2-Hydroxy-3,3-dimethyl-2-butanyl]-6-methoxy-18,19-dihydro-4,5-epoxy-6,14-ethenomorphinan-3-yl (5ξ)-β-D-lyxo-hexopyranosiduronic acid;
CAS Number	469887-29-4;
PubChem CID	46782577;
ChemSpider	35517741;
UNII	YPZ2R0PR50;
ECHA InfoCard	100.230.712
Chemical and physical data
Formula	C31H43NO10
Molar mass	589.682 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES C[C@]([C@H]1C[C@@]23CC[C@@]1([C@H]4[C@@]25CCN[C@@H]3Cc6c5c(c(cc6)O[C@H]7[C@@H]([C@H]([C@@H]([C@H](O7)C(=O)O)O)O)O)O4)OC)(C(C)(C)C)O;
	InChI InChI=1S/C31H43NO10/c1-27(2,3)28(4,38)16-13-29-8-9-31(16,39-5)26-30(29)10-11-32-17(29)12-14-6-7-15(22(42-26)18(14)30)40-25-21(35)19(33)20(34)23(41-25)24(36)37/h6-7,16-17,19-21,23,25-26,32-35,38H,8-13H2,1-5H3,(H,36,37)/t16-,17-,19+,20+,21-,23+,25-,26-,28+,29-,30+,31-/m1/s1; Key:OOLGGESLZHGXGC-TXYLTYGDSA-N;

Norbuprenorphine-3-glucuronide (N3G) is a major active metabolite of the opioid modulator buprenorphine.^[1] It has affinity for the κ-opioid receptor (K_i = 300 nM) and the nociceptin receptor (K_i = 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]

References

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