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