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The relative positions and structural analyses of (A) PGS prepolymer mix with l-arginine (5/1 w/w) and PGS-g-Arg prepolymers with the grafting content of (B) 7%, (C) 13%, and (D) 18% l-arginine, respectively on 1H-NMR spectra (d-solvent: CD3OD).
