2 2 6 6-tetramethylpiperidinyloxyl July 8, 2019 16 32 64 128 2 2 6 6-tetramethyl piperidinyloxy l 2 2 6 6-tetramethyl piperidinyloxy (tempo 4-hydroxy-2 2 6 6-tetramethyl piperidinyloxy l 2 2 6 6-tetramethyl-piperidine-n-oxyl 2 2 6 6-tetramethylpiperidine-1-oxyl 2 2 6 6-tetramethyl-4-oxopiperidine 2 2 6 6-tetramethyl-piperidine
