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