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500 MHz 1H NMR spectra: (a) alkyne-functionalized ε-caprolactone (CL) (1), (b) alkyne-functionalized poly(ethylene glycol)-b-poly(ε-caprolactone) (PEG-b-PCL) (2), and (c) 6-azidohexyl 4-formylbenzoate pH-responsive spacer molecule (3) in CDCl3.
