β-Hydroxythiofentanyl-d5 (hydrochloride) (exempt preparation) is intended for use as an internal standard for the quantification of β-hydroxythiofentanyl by GC- or LC-MS. β-Hydroxythiofentanyl is categorized as an opioid.[1] β-Hydroxythiofentanyl-d5 (hydrochloride) (exempt preparation) is provided as a DEA exempt preparation. This product is intended for research and forensic applications.
References:
[1].Henderson, G.L.Designer drugs: Past history and future prospectsJ. Forensic Sci.33(2)569-575(1988).
















