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