In preferred compounds of {TAIL ~ Formula I}, Y is an dialkoxyphosphonate, or α hydroxyamide group and {HEAD ~ Z} is an acyl or α ketocarbamate functionality 
In preferred compounds of { TAIL ~ Formula I } , Y is an dialkoxyphosphonate , or α hydroxyamide group and { HEAD ~ Z } is an acyl or α ketocarbamate functionality
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH