Etohexadiol (or ethohexadiol) is an

ectoparasiticide An ectoparasiticide is an antiparasitic drug used in the treatment of ectoparasitic infestations. These drugs are used to kill the parasites that live on the body surface. Permethrin, sulfur, lindane, dicophane, benzyl benzoate, ivermectin and ...

. It was known as the insect repellent "6-12" (Six-twelve), or Rutgers 612. Its use in the U.S. was halted in 1991 after it was shown to cause developmental defects in animals.

References

Alkanediols Insect repellents {{antiinfective-drug-stub