Flubromazolam (CAS 612526-40-6) is a highly potent, triazole-fused designer benzodiazepine characterized by a fluorine atom at the 2′-position and a bromine atom at the 8-position of the core scaffold. In B2B procurement, it is primarily sourced as a high-purity analytical reference standard for forensic toxicology, clinical diagnostics, and metabolic profiling. Unlike classical benzodiazepines, flubromazolam operates at sub-milligram active doses, resulting in ultra-low circulating concentrations that frequently evade standard immunoassay screens [1]. Consequently, laboratories must procure fully characterized flubromazolam reference materials to calibrate highly sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) workflows, ensuring accurate quantification and definitive structural identification in complex biological matrices .