Notes: N,N-didesmethyl AH 7921 (Item No. 20281) is an analytical reference standard that is structurally categorized as an opioid metabolite. It is a predominant metabolite of AH 7921 (Item No. 12036) incubated with human liver microsomes that is also abundant in hydrolyzed urine case samples.{32486} The physiological and toxicological properties of this compound are not known. This product is intended for research and forensic applications.