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