In another embodiment, the water soluble and non peptidic polymer has the structure HO POLYa Rq and the 1 benzotriazolylcarbonate ester of the water soluble and non {HEAD ~ peptidic polymer} has {TAIL ~ the structure} 
has
In another embodiment , the water soluble and non peptidic polymer has the structure HO POLYa Rq and the 1 benzotriazolylcarbonate ester of the water soluble and non { HEAD ~ peptidic polymer } has { TAIL ~ the structure }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL