Phytocannabinoid Mixture 4 (CRM) is a certified reference material mixture that contains compounds that can be isolated from plants in the genus Cannabis. The mixture is supplied in an amber ampule in which the headspace has been purged with argon. It is designed for use as a reference standard for these major controlled substances during routine analytical checks using HPLC-UV or LC- or GC-MS instrumentation. This product is intended for research and forensic applications. Phytocannabinoid Mixture 4 (CRM) is provided as a DEA exempt preparation. Included are •9-THC, •8-THC, THCA-A, and cannabidiol.