Propanedioic acid, (4-methoxyphenyl)methylene-, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) ester Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) 2-(4-methoxyl-benxylidene)malonate bis(1,2,2,6,6-pentamethyl-4-piperidinyl) 2-(4-methoxybenzylidene)malonate Sanduvor PR 31 PR 31 PBH 3 Hostavin PR 31 Bis(1,2,2,6,6-pentamethylpiperidin-4-yl) p-methoxybenzylidenemalonate