A highly reproducible method for the measurement of [6‐O‐methyl‐11C]diprenorphine and its radio‐metabolites based on solid‐phase extraction and radio‐high‐pressure liquid chromatography. - Fairclough, Michael; McMahon, Adam; Barnett, Elizabeth; Matthews, Julian; Brown, Christopher A.; Jones, Anthony (Journal of Labelled Compounds & Radiopharmaceuticals, 2021)