[CAS Number 136765-24-7] α-Hydroxyalprazolam-D5 is a stable-labeled internal standard used for the quantification of α-hydroxyalprazolam. α-Hydroxyalprazolam is an active metabolite of alprazolam, a short-acting anxiolytic thought to enhance specific neurotransmitters' activity in the brain. Alprazolam, sold under the trade name Xanax, is prescribed to treat anxiety disorder, panic disorder, and anxiety caused by depression. α-Hydroxyalprazolam-D5 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.