2,2,3,3,5,6-hexamethyl-4-oxidopyrazin-1-ium 1-oxide

[2-(1,3-苯并二氧戊环-5-基)-4,4,5,5-四甲基-3-氧代-4,5-二氢-1H-咪唑-1-基]氧氮自由基

丙酮肟

3-氧代-2-苯基-4,4,5,5-四甲基咪唑啉-1-氧

1,3-dihydroxy-4,4,5,5-tetramethyl-2-phenylimidazolidine