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