59042-50-1 Cyclopropanecarboxylic acid, 3-(2,2-dichloroethenyl)-2,2-dimethyl, (1R,3S)-rel- Cyclopropanecarboxylic acid, 3-(2,2-dichloroethenyl)-2,2-dimethyl-, trans- trans-3-(2,2-Dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid trans-Permethric acid