2-((2-Methyl-1-oxo-2-propenyl)oxy)ethyl 2-(acetyloxy)benzoate homopolymer 80044-26-4 Asa-polymer Benzoic acid, 2-(acetyloxy)-, 2-((2-methyl-1-oxo-2-propenyl)oxy)ethyl ester, homopolymer Poly(beta-(acetylsalicylyloxy)ethylmethacrylate)