... dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate Comprises a mixture of four diastereoisomeric pairs of enantiomers I (R)-a-cyano-4-fluoro-3-phenoxybenzyl ... (1R)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate + (S)-a, (1S)-cis-; II (S)-a ... , (1R)-cis- + (R)-a, (1S)-cis-; III (R)-a, (1R)-trans- + (S)-a, (1S)-trans ...