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