Fenethylline-D3.HCl is a stable-labeled internal standard used for the quantification of fenethylline.HCl. Fenethylline.HCl, also known as Captagon, is a codrug of amphetamine and theophylline, possessing stimulant and psychoactive properties. Used in the past to treat ADHD, narcolepsy, and depression, Fenethylline.HCl has since been banned due to its high potential for abuse. Fenethylline-D3.HCl is available as reference material (bulk powder and/or solution) and as calibrated, Ready-to-Use, certified reference material (CRM). This product is designed for qualitative and quantitative protocols and can be used for forensic, toxicology, research, and other chemical/biochemical analytical applications.