allethrins

al·le·thrins

(al'ĕ-thrinz),
Allethrolone esters of chrysanthemum-monocarboxylic acids and synthetic analogues of pyrethrins, which are pyrethrolone esters of the same acids; viscous liquids, insoluble in water that can be absorbed by lungs, skin, and mucous membranes and may cause liver and kidney injury, with lung congestion; used as an insecticide.