N-Pyrrolidino etonitazene-d5 (CRM) (Item No. 42256) is intended for use as an internal standard for the quantification of N-pyrrolidino etonitazene (Item Nos. 42194 | 33169 | 38255) by GC- or LC-MS. N-Pyrrolidino etonitazene is categorized as an opioid.1 It has been associated with overdose fatalities as the cause of death or in combination with other compounds. N-Pyrrolidino etonitazene-d5 is regulated as a Schedule I compound in the United States. N-Pyrrolidino etonitazene-d5 (CRM) (Item No. 42256) 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.