The down field region of ¹H NMR spectra (400 MHz) for: (a) a solution of the MeO-PEGN-Succ-RSV (2 kDa) conjugate mixture in d₆-DMSO; (b) a solution of resveratrol in d₆-DMSO; and (c) the solution from (a) after treatment with water and heat (90°C) for ca. 1 week).

In (c) the signals for free resveratrol are highlighted in red and those for the remaining resveratrol-PEG conjugates are highlighted in blue. Full width versions of these spectra are provided in S1 File, along with a comparison with the MeO-PEG-Succ-OH starting material.