1-羟基-2,2,6,6-四甲基哌啶-4-酮

2,2,6,6-tetramethyl-1,4-dioxo-piperidinium

2,6-dimethyl-6-nitrosohept-2-en-4-one

2,6-dimethyl-2-nitrohept-5-en-4-one

2,6-dimethyl-6-nitroso-hept-1-en-4-one