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Chemical formulas of components used for the peptide-based nanogel formulation. Internal core (red) is formed by Fmoc-Phe-Phe-OH (Fmoc-FF). External surfactants shell (green) was formulated using d-α-tocopherol polyethylene glycol 1000 succinate (E-TPGS-PEG1000) or mixing SPAN® 60 (sorbitan monostearate) and TWEEN® 60 (polyethylene glycol sorbitan monostearate) in different ratios.
