2 2 6 6-tetramethylpiperidine-1-oxyl radical July 8, 2019 16 32 64 128 2 2 6 6 tetramethylpiperidine 1 oxyl radical tempo 2 2 6 6-tetramethylpiperidine-1-oxyl (free radical) 4 hydroxy-2 2 6 6 tetramethylpiperidine 1-oxyl free radical 4-amino-2 2 6 6-tetramethylpiperidine 1-oxyl free radical 2 2 6 6-tetramethylpiperidine-1-oxyl 2 2 6 6-tetramethylpiperidinyloxyl
