Synonyms: α.-DL-trans-Allethrin;alpha-Dl-trans-allethrin;Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-, (1R)-2-methyl-4-oxo-3-(2-propenyl)-2-cyclopenten-1-yl ester, (1R,3R)-rel-;Cyclopropanecarboxylic acid, 2,2-dimethyl-3-(2-methyl-1-propenyl)-, ster with 2-allyl-4-hydroxy-3-methyl-2-cyclopenten-1-one, trans-(+-)-