Wikipedia
Bioallethrin
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 ) is a mixture of the same two stereosiomers, but in an approximate ratio of R:S = 1:3.
Esbioallethrin or S-bioallethrin ( CAS number ) is the pure S-form (that is, the wedge in the structure as shown in the box points down).