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