In addition, the benzothiazole boroxines 4c and 4f were successfully used for Cumediated 18 F-fluorination (Scheme 3B). Based on our preliminary studies on 18 Ffluorination of boroxines , the 18 F-labeling of 4c and 4f to yield Animals were injected with the tracer alone ("control", blue) compared to animals preinjected with suvorexant (1 mg/kg, 15 min prior to tracer injection; "blocking", red) or cyclosporine A (25 mg/kg, 30 min prior to tracer injection; green).