2-Bromobutanoic acid ethyl ester 533-68-6 66025-42-1 AI3-52371 Butanoic acid, 2-bromo-, ethyl ester Butyric acid, 2-bromo-, ethyl ester (8CI) EINECS 208-574-6 Ethyl 2-bromobutanoate Ethyl 2-bromobutyrate Ethyl alpha-bromobutyrate NSC 8855