Bioallethrin is a brand name for an ectoparasiticide. It consists of two of the eight stereosiomers of allethrin I in an approximate ratio of 1:1. The name Bioallethrin is a registered trademark of Sumitomo Chemical Co., Ltd. Esbiothrin (CAS number {CAS|260359-57-5}) is a mixture of the same two stereosiomers, but in an approximate ratio of R:S = ...