sodium 2,2,6,6-tetramethylpiperidine-1-oxyl

2,2,6,6-tetramethylpiperidin-1-ium 1-oxide

1-羟基-2,2,6,6-四甲基哌啶-4-酮

苯肼

2,2,6,6-四甲基-1-(1-苯基乙氧基)哌啶