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6β-Naltrexol-d₃ (Item No. 18350) is an analytical reference material intended for use as an internal standard for the quantification of 6β-naltrexol by GC- or LC-MS. 6β-Naltrexol is the major metabolite of naltrexone (Item Nos. ISO60192 | 15520). It is a neutral μ-opioid receptor antagonist (K_i = 94 pM). This product is intended for research and forensic applications.

6β-Naltrexol-d3 (6β-Hydroxynaltrexone-d3) is deuterium labeled 6β-Naltrexol. 6β-Naltrexol (6β-Hydroxynaltrexone), the primary metabolite of Naltrexone, is a peripherally selective opioid antagonist. 6β-Naltrexol selectively inhibits gastrointestinal opioid effects in human subjects and inhibits Morphine-induced slowing of gastrointestinal transit[1][2].

[1] Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019 Feb;53(2):211-216. DOI:10.1177/1060028018797110
[2] Cone EJ, et al. Biosynthesis, isolation, and identification of 6-beta-hydroxynaltrexone, a major human metabolite of naltrexone. J Pharm Sci. 1975 Apr;64(4):618-21. DOI:10.1002/jps.2600640409
[3] Yancey-Wrona J, et al. 6β-naltrexol, a peripherally selective opioid antagonist that inhibits morphine-induced slowing of gastrointestinal transit: an exploratory study. Pain Med. 2011 Dec;12(12):1727-37. DOI:10.1111/j.1526-4637.2011.01279.x