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Chemical structures of biodegradable polymers employed for ocular drug delivery. The natural polymers discussed are chitosan (a), hyaluronic acid (b), sodium alginate (c) and carboxymethylcellulose sodium (d). The synthetic polymers discussed are poly(lactic-co-glycolic acid) (e), poly(ɛ-caprolactone) (f) and poly(ethylene glycol) (g).
