The polymer 8, wherein at least 25% of {HEAD ~ the polymer} comprises {TAIL ~ residues} of a compound 1 
comprises
The polymer 8 , wherein at least 25 % of { HEAD ~ the polymer } comprises { TAIL ~ residues } of a compound 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH