| http://www.w3.org/ns/prov#value | - After release of the derivative from the drug delivery system it may be converted by enzymes, hydrolysed by body pH or other metabolic processes to the parent drug or to another biologically active form.A pharmaceutical composition of the invention may in addition be suitable for the delivery of peptides, polypeptides or proteins, for example hormones, enzymes such as lipases, proteases, carbohydr
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