Acetyl fentanyl-d5 (hydrochloride) (CRM) (Item No. ISO60129) is a certified reference material intended for use as an internal standard for the quantification of acetyl fentanyl (Item Nos. ISO60128 | ISO00128) by GC- or LC-MS. Acetyl fentanyl is categorized as an opioid.1 Acetyl fentanyl is regulated as a Schedule I compound in the United States. Acetyl fentanyl-d5 (hydrochloride) (CRM) (Item No. ISO60129) is provided as a DEA exempt preparation. This product is intended for research and forensic applications.WARNING This product is not for human or veterinary use.