potassium 4-(2,4-dichlorophenoxy)butyrate 2,4-dichlorophenoxybutyric acid potassium salt 4-(2,4-Dichlorophenoxy)butyric acid potassium salt 2,4-Db-potassium 2,4-Db-potassium [iso] Einecs 243-102-2 Butanoic acid, 4-(2,4-dichlorophenoxy)-, potassium salt 2,4-DB Potassium Salt