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