1-Oxyl-2,2,6,6-tetramethylpiperidino-4-hydrazine 1-Piperidinyloxy, 4-hydrazino-2,2,6,6-tetramethyl- 2,2,6,6-Tetramethylpiperidino-1-oxyl-4-hydrazine 89367-59-9 Tempo-hydrazine