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