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(a) Hydrolysis mechanism for PEG–Ad; (b) 1H NMR (D2O) with Bruker 300 MHz, noting a hydrolysis peak at δ = 6.1 ppm and a reference peak at δ = 4.2 ppm (−CH2−); and (c) a species percentage was quantitively obtained from hydrolysis peak δ = 6.1 ppm.
