wherein m and n are integers and {HEAD ~ R} is {TAIL ~ a substituted or unsubstituted alkyl} or aryl group 
is
wherein m and n are integers and { HEAD ~ R } is { TAIL ~ a substituted or unsubstituted alkyl } or aryl group
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