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