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Investigated radiolabeling protocols for the preparation of [11C]tozadenant ([11C]13). Conditions: (a) [11C]MeI, base, solvent, t; (b) [11C]MeOTf, acetone or MeCN, rt; (c) [11C]MeI, 1 m NaOHaq (2 equiv), DMF, 60 °C; (d) [11C]MeI, 1 m NaOHaq (2 equiv), solvent, 60 °C.
