{TAIL ~ The oxygenated hydrocarbons} may originate from {HEAD ~ any source}, but are preferably derived from biomass 
{ TAIL ~ The oxygenated hydrocarbons } may originate from { HEAD ~ any source } , but are preferably derived from biomass
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH