A compound of Formula I {HEAD ~ ##STR71}## wherein: {TAIL ~ R1} is chosen from the group consisting of alkyl, n cycloalkyl, n NHC alkyl, and arylalkyl, wherein n=1 3, 
wherein
A compound of Formula I { HEAD ~ # # STR71 } # # wherein : { TAIL ~ R1 } is chosen from the group consisting of alkyl , n cycloalkyl , n NHC alkyl , and arylalkyl , wherein n=1 3 ,
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH