FA-PEG-COOH (MW 2000) (Folate-PEG-COOH (MW 2000)) is a PEG derivative modified with folic acid, featuring a carboxyl group (-COOH). The carboxyl group readily forms stable amide bonds with amino groups and ester bonds with hydroxyl groups. Folic acid (-FA) has a high affinity for folate receptors, making it suitable for cell membrane receptor-targeted drug delivery.
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