The insecticides contain Propoxur, Pyretrines, {HEAD ~ silicates} and {TAIL ~ a combustible wax} 
The insecticides contain Propoxur , Pyretrines , { HEAD ~ silicates } and { TAIL ~ a combustible wax }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL