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