10537-84-5 Butanoic acid, 2-((3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)methylene)-3-oxo-, ethyl ester Ethyl 2-((3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)methylene)-3-oxobutanoate beta-Ethoxycarbonyl-beta-acetyl-3,5-di-tert-butyl-4-hydroxystyrene