1,2-diphenyldiazene

(4,4-dimethoxy-2,2,6,6-tetramethylpiperidin-1-yl) acetate

2,2,6,6-四甲基吡啶-1-氧基-4-氨基-4-羧酸

2,2,6,6-tetramethyl-1-(1-phenylethoxy)piperidin-4-one