Notes: Aniline (hydrochloride) (Item No. 21963) is an analytical reference standard that is structurally categorized as a synthetic intermediate. It is used to make the imine derivative of NPP (Item No. 20528) as part of the synthesis of fentanyl (Item Nos. 14719 / ISO60197 ) and its derivatives.{34312} This product is intended for research and forensic applications.