Cyclopentyl fentanyl-d5 (hydrochloride) (Item No. 22391) is an analytical reference standard intended for use as an internal standard for the quantification of cyclopentyl fentanyl (Item No. 20439) by GC- or LC-MS. Cyclopentyl fentanyl is categorized as an opioid.1 Cyclopentyl fentanyl-d5 is regulated as a Schedule I compound in the United States. This product is intended for research and forensic applications.WARNING This product is not for human or veterinary use.
