ühendid struktuuriga   R2N–O·↔R2N·+–O−; hüdroksüülamiinidest vesiniku aatomi eemaldamisel tekkivad radikaalid, compounds having the structure R2N–O·↔R2N·+–O−; they are radicals  derived from hydroxylamines  by removal of the hydrogen atom from the hydroxy group, and are in many cases isolable