(3-Hydroxy-2,2,5,5-tetramethylpyrrolizinooxy)radical

[(2,2,5,5-Tetramethyl-3-hydroxypyrrolizino)oxy]radical

(3-Hydroxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxy)radical

(2,2,5,5-Tetramethyl-3-hydroxypyrrolidine-1-yloxy)radical