Butyryl norfentanyl (hydrochloride) (CRM) (Item No. 19561) is an analytical reference material that is structurally categorized as an opioid. It is a presumptive metabolite of butyryl fentanyl (Item Nos. 19734 | 14728). The physiological and toxicological properties of this compound are not known. This product is intended for research and forensic applications.WARNING This product is not for human or veterinary use.