1-Piperidinyloxy, 4,4'-((1,4-dioxo-1,4-butanediyl)diimino)bis(2,2,6,6-tetramethyl- 21184-43-0 N,N'-Bis(2,2,6,6-tetramethyl-1-oxyl-4-piperidinyl)succinamide Ro 03-9199