Metonitazene-d3 (citrate) (Item No. 31648) is an analytical reference standard intended for use as an internal standard for the quantification of metonitazene (Item Nos. 26398 | 31303) by GC- or LC-MS. Metonitazene is categorized as an opioid.{61330} Metonitazene has analgesic effects in mice.{57991} Metonitazene-d3 is regulated as a Schedule I compound in the United States. This product is intended for research and forensic applications.