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