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The title compound, C 9 H 20 NO + ·C 2 F 3 O 2− , is an important inter­mediate in the synthesis of hindered light stabilizers. The piperidinium ring adopts a chair conformation with the hydroxyl group in an equatorial position. The crystal packing is stabilized by O—H⋯O and N—H⋯O hydrogen bonds. The CF 3  group is disordered over two positions with almost equal site occupancy factors.

4-Hydroxy-2,2,6,6-tetramethylpiperidinium trifluoroacetate