Synonyms: 1,2,3,4-Butanetetracarboxylic acid, tetramethyl ester, reaction products with 2,2,6,6-tetramethyl-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, reactionproducts with 2,2,6,6-tetramethyl-4-piperidinol and .beta.,.beta.,.beta.’,.beta.’-tetramethy-2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diethanol