2 2 6 6-tetramethyl piperidinyloxy l July 8, 2019 16 32 64 128 2 2 6 6-tetramethylpiperidinyloxyl 2 2 6 6-tetramethyl-1-piperidinyloxy 2 2 6 6-tetramethylpiperidine-1-oxyl 2 2 6 6-tetramethylpiperidine
