{TAIL ~ Some} of the compounds of the present invention may have trans and {HEAD ~ cis isomers} 
{ TAIL ~ Some } of the compounds of the present invention may have trans and { HEAD ~ cis isomers }
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD