FA-PEG-COOH (MW 1000) (Folate-PEG-COOH (MW 1000)) is a PEG derivative modified with folic acid, featuring a carboxyl group (-COOH). This group can readily form stable amide bonds with amino groups, or ester bonds with hydroxyl groups. Folic acid (-FA) specifically binds to high-affinity folate receptors, making it suitable for targeted drug delivery to cell membrane receptors.
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