3,4-Dichloro-5-isothiazolecarboxylic acid potassium salt 5-ISOTHIAZOLECARBOXYLIC ACID, 3,4-DICHLORO-, POTASSIUM SALT 67403-00-3 Caswell No. 309BB EPA Pesticide Chemical Code 210400 Potassium 3,4-dichloro-5-isothiazolecarboxylate