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Figure  S1. Chemical structure of sPPp and its acetylated derivative, Ac-sPPp. The photosensitizer portion of the molecule, pyropheophorbide-a (PPa), is shown in green, and the short linear PEG portion of the molecule, consisting of two PEG(11-mer) units, is shown in blue. Two intervening amino acids (aspartate and lysine; note that aspartate is linked to the epsilon amine of lysine) connecting PPa to the short linear PEG are shown in orange. For sPPp, R is H. For Ac-sPPp, R is an acetyl group.

Figure  S2. HPLC analysis and mass spectrometry of sPPp. A, HPLC analysis. A Beckman Gold HPLC with a Phenomenex Proteo C18 column was used for the analysis (solvent A: 0.1% trifluoroacetic acid [TFA]/water; solvent B: 0.1% TFA/acetonitrile; gradient: 30–90% B in 30 min; flow rate: 1 mL min−1; detection wavelength: 215 nm). B, electrospray ionization mass spectrometry.

Figure  S3. HPLC analysis and mass spectrometry of Ac-sPPp. A, HPLC analysis. A Beckman Gold HPLC with a Phenomenex Proteo C18 column was used for the analysis (solvent A: 0.1% TFA/water; solvent B: 0.1% TFA/acetonitrile; gradient: 30–90% B in 30 min; flow rate: 1 mL min−1; detection wavelength: 215 nm). B, electrospray ionization mass spectrometry.

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