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