Non energetic and energetic components are {HEAD ~ essentially organic compounds}, which are {TAIL ~ substances} with defined chemical compositions 
Non energetic and energetic components are { HEAD ~ essentially organic compounds } , which are { TAIL ~ substances } with defined chemical compositions
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH