1,3,5-Triazine-2,4,6-triamine, N-[2-[4-[4,6-bis[(2,2,6,6-tetramethyl-4-piperidinyl)amino]-1,3,5-triazin-2- yl]-1-piperazinyl]ethyl]-N,N’,N”-tris(2,2,6,6-tetramethyl-4-piperidinyl)-