Definition: Heterocyclic compounds in which an oxygen is attached to a cyclic nitrogen.
Other names Heterocyclic N-Oxides; Oxides, Cyclic N; N-Oxides, Heterocyclic; N-Oxides, Cyclic; N Oxides, Cyclic; Heterocyclic N Oxides; Cyclic N Oxides
tempol [ 2,2,6,6-tetramethyl-4-piperidinol-N-oxyl,4-hydroxy-1-oxyl-2,2,6,6-tetramethylpiperidine,4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl,4-hydroxy-2,2,6,6-tetramethylpiperidinoxy radical,4-hydroxy-2,2,6,6-tetramethylpiperidinyl-1-oxy,HyTEMPO,N-Oxyl-2,2,6,6-tetramethylpiperidine,TMPN,nitroxide 4-hydroxy-2,2,6,6-tetramethylpiperidinyl-N-oxyl,nitroxyl-2 (2,2,6,6-tetramethyl 4-oxypiperidine)-1-oxyl,tanol ] tempo is paramagnetic radical used in NMR as SPIN LABELS whereas TEMPO-H is not