Abstract Introduction:(R)-3-(2-(methylthio) phenoxy)-N-methyl-3-phenylpropan-1-amine [(R)– thionisoxetine; 1] is a potent inhibitor of the norepinephrine transporter (NET). We aimed to label 1 with carbon-11 (t 1/2= 20.4 min) for evaluation as a radioligand for imaging NET in living brain with positron emission tomography (PET). Methods: Methyl 3-(2-((R)-3- (methylamino)-1-phenylpropoxy) phenylthio)-propanoate (MPPP) and 1 were each ...