(S)-Fenvalerate (S)-cyano-(3-phenoxy phenyl)-methyl-(S)-4-chloro-α-(1-methyl ethyl) benzene acetate Chloro-α-(1-methylethyl)benzeneacetic acid cyano(3-phenoxyphenyl)methyl ester (CAS) (S-(R,R))-4-chloro-α-(1-methylethyl) benzeneacetic acid cyano-(3-phenoxyphenyl)methylester (S)-α-cyano-3-phenoxy benzyl (S)-2-(4-chloro-phenyl) isovalerate Fenvalerate A-Alpha (S-(R*,R*))-Benzeneacetic acid, 4-chloro-α-(1-methylethyl)-cyano(3-phenoxyphenyl)methylester Cyano-3-phenoxybenzyl (S)-2-(4-chlorophenyl)isovalerate Esfenvalerate is a synthetic pyrethroid insecticide marketed under the brand Asana.

[2] It is the (S)-enantiomer of fenvalerate.

[3] In the United States, a limit of .05 ppm of the chemical's residue is permissible in food.

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