Next, the pitch product is solvent fractionated to separate mesogens which contain {HEAD ~ metals} from {TAIL ~ the organometallic compounds} 
Next , the pitch product is solvent fractionated to separate mesogens which contain { HEAD ~ metals } from { TAIL ~ the organometallic compounds }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL