2(5H)-Furanone, 3,4-dibromo-5-(4-butoxyphenyl)- 2(5H)-Furanone, 3,4-dibromo-5-(p-butoxyphenyl)- (8CI) 21958-17-8 3,4-Dibromo-5-(4-butoxyphenyl)-2(5H)-furanone Frolon gamma-4-n-Butoxyphenyl-alpha,beta-dibromo-delta(sup alpha,beta)-crotonic acid lactone