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General properties: Name：PEG3400-Se-Se-PLGA40K(75/25) Cat.#：QY-C-S3 Date of Analysis： 2020.5.14 Recommended Retest date： 2021.5.14 Stability： 12 months Storage： -20°C in the dark               Items Specification Results Appearance Solid Solid 1H NMR Identical to the   Structure Identical to the   Structure Foreign Material None None Substitution ＞95% ＞95% Report Date: 2020.5.14