Notes: Despropionyl carfentanil (Item No. 33866) is an analytical reference standard categorized as an intermediate in the synthesis of carfentanil (Item Nos. 19884 / 31340 / 19410), sufentanil (Item Nos. 23983 / 15917 / 90003093), and remifentanil (Item Nos. 22429 / 19291 / 21926).{62125} This product is intended for research and forensic applications.