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1H-NMR spectra of mPEG-PEG, PEG-Phe-Fmoc, BMPS-Phe-PEG-Chol, and RGD-PEG-Chol in CDCl3. (a, b) 6- and 3-position protons in cholesterol; (c) the repeating units of methoxyl in mPEG or PEG; (d) the protons in the terminal group of mPEG; (e) methylene proton of succinyl group; (f) protons in the Fmoc group; (g) protons on maleimidyl group of linkers.
