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9 (blood), 0.1 (urine) and 3.2 ng/mL (cerebrospinal fluid). The concentration of 4F-MDMB-BINACA in cerebrospinal fluid was 0.1 ng/mL. The main metabolites of both compounds (hydrolysis and oxidative defluorination) were found in all analysed body fluids. Cerebrospinal fluid may be important alternative material in autopsy cases. Rapid elimination of 5F-MDMB-PICA and 4F-MDMB-BINACA compounds also means that the metabolite analysis can be crucial for the investigation. Laboratories must be made aware of their presence and incorporate thes