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(a) 1H NMR (DMSO-d6) of 1-adamantanecarbonyl chloride which confirmed a 97.33% purity; (b) 1H NMR (DMSO-d6) of maleimide–PEG5000–hydroxyl; and (c) Ad–PEG5000–Mal 1H NMR (DMSO-d6), with unique peaks at δ = 1.7–1.9 ppm (Ad hydrocarbons, ◆), δ = 4.2 ppm (terminal −CH2− of PEG, ▴), and δ = 3.6 ppm (−CH2− PEG repeat units, *).
