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