Synonyms: Ro 03-9199;AC1L50Y2;ST000220;N,N'-Bis(2,2,6,6-tetramethyl-1-oxyl-4-piperidinyl)succinamide;1-Piperidinyloxy, 4,4'-((1,4-dioxo-1,4-butanediyl)diimino)bis(2,2,6,6-tetramethyl-;N-(1-hydroxy-2,2,6,6-tetramethyl(4-piperidyl))-N'-(1-hydroxy-2,2,6,6-tetrameth yl(4-piperidyl))butane-1,4-diamide