3-Chloro-4-t-butyl-gamma-oxobenzenebutanoic acid butyl ester 32780-44-2 BRN 2877704 Benzenebutanoic acid, 3-chloro-4-(1,1-dimethylethyl)-gamma-oxo-, butyl ester Butyl 3-chloro-4-(1,1-dimethylethyl)-gamma-oxobenzenebutanoate CB 841