1,2,3,4-Butanetetracarboxylic acid, tetramethyl ester, reaction products with 1,2,2,6,6-pentamethyl-4-piperidinol and beta,beta,beta',beta'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol
1,2,3,4-Butanetetracarboxylic acid, tetramethyl ester, reaction products with 1,2,2,6,6-pentamethyl-4-piperidinol and beta,beta,beta',beta'-tetramethyl-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol
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