R5 is {TAIL ~ ##STR72## R9} is independently selected from the group consisting of {HEAD ~ alkyl} and arylalkyl 
R5 is { TAIL ~ # # STR72 # # R9 } is independently selected from the group consisting of { HEAD ~ alkyl } and arylalkyl
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH