The term lower is used above to denote {TAIL ~ organic groups} containing {HEAD ~ eight or fewer carbon atoms} 
The term lower is used above to denote { TAIL ~ organic groups } containing { HEAD ~ eight or fewer carbon atoms }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD