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