Tariquidar (MedChemExpress, New
Jersey, USA) was used as a P-gp inhibitor.24 (link),29 (link),36 (link) Tariquidar solution for intravenous
injection was prepared as previously described,37 (link) with 11 mg of Tariquidar methanesulfonate hydrate suspended
in 3 mL of saline solution, and the injection volume was adjusted
to the weight of each monkey (8 mg/kg of body weight). Radiosynthesis
and quality control of (R)-[11C]verapamil
were performed as described previously.21 (link)