Synonyms: Cyclopropanecarboxylicacid, 3-(2,2-dichloroethenyl)-2,2-dimethyl-, cis-; (?à)-cis-3-(2,2-Dichlorovinyl)-2,2-dimethylcyclopropanecarboxylicacid; (?à)-cis-Cypermethric acid; (?à)-cis-Permethrinic acid;cis-(Dichlorovinyl)dimethylcyclopropanecarboxylic acid; cis-(?à)-Cypermethric acid;cis-2,2-Dimethyl-3-(2,2-dichlorovinyl)cyclopropanecarboxylic acid;cis-3-(2,2-Dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid;cis-3-(2,2-Dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acid;cis-3-(2,2-Dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid;cis-DL-3-(2,2-Dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid;cis-Permethric acid; cis-Permethrinic acid