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