| http://www.w3.org/ns/prov#value | - X2 and X4 join polymeric arms R16 and R17 to C. Exemplary linkage fragments for X2, X3 and X4 are independently selected and include S, SC(O)NH, HNC(O)S, SC(O)O, O, NH, NHC(O), (O)CNH and NHC(O)O, and OC(O)NH, CH2S, CH2O, CH2CH2O, CH2CH2S, (CH2)oO, (CH2)oS or (CH2)oY???-PEG wherein, Y??? is S, NH, NHC(O), C(O)NH, NHC(O)O, OC(O)NH, or O and o is an integer from 1 to 50.
|
