3-Chloro-4-(1-methylethyl)-gamma-oxobenzenebutanoic acid butyl ester 33035-11-9 BRN 2874034 Benzenebutanoic acid, 3-chloro-4-(1-methylethyl)-gamma-oxo-, butyl ester Butyl 3-chloro-4-(1-methylethyl)-gamma-oxobenzenebutanoate CB 845