FA-PEG-COOH (MW 600) (Folate-PEG-COOH (MW 600)) is a polyethylene glycol (PEG) derivative modified with folic acid, featuring a carboxyl group (-COOH). The carboxyl group can readily form stable amide bonds with amino groups and ester bonds with hydroxyl groups. Folic acid (-FA) has high affinity for folate receptors, making it useful for targeted drug delivery to cell membrane receptors.
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