As examples, Ra and Rb may be hydrogen, {HEAD ~ B} is {TAIL ~ a C2 C12 acyl group}, R is phenyl and n is 0 12 
is
As examples , Ra and Rb may be hydrogen , { HEAD ~ B } is { TAIL ~ a C2 C12 acyl group } , R is phenyl and n is 0 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH