FA-PEG-COOH (MW 400) (Folate-PEG-COOH (MW 400)) is a PEG derivative modified with folic acid, incorporating a carboxyl group (-COOH). The carboxyl group can easily form stable amide bonds with amino groups and ester bonds with hydroxyl groups. Folic acid (-FA) targets cell membrane receptors with high affinity folate receptors, making it suitable for targeted drug delivery.
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