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