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Tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate Tetrakis-(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,2,3,4-butanetetracarboxyla 1,2,3,4-Butanetetracarboxylic acid tetrakis(1,2,2,6,6-pentamethylpiperidin-4-yl) ester 1,2,3,4-Butanetetracarboxylic acid, tetrakis(1,2,2,6,6-pentamethyl-4-piperidinyl)ester Butane-1,2,3,4-tetracarboxylic acid tetrakis(1,2,2,6,6-pentamethyl-4-piperidinyl) ester 1,2,3,4-Butanetetracarboxylic acid, 1,2,3,4-tetrakis(1,2,2,6,6-pentamethyl-4 -piperidinyl) ester