Figure 2. 1H NMR spectra of (A) CR15 (B) PEG-PLA-COOH, (C) PEG-PLA-R15, and (D) PEG-PLA-SS-R15.
The purified products have characteristic peaks from both guanidine group (δ 7.43, 4H) in R15 and PLA segment (δ 5.19, 1H).
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