| http://www.w3.org/ns/prov#value | - Ar and R are preferably selected so that the hydrolysis products of the polyanhydrides have a chemical structure resembling pharmaceutically-active materials, particularly salicylates such as aspirin, non-steroidal anti-inflammatory naphthyl or phenyl propionates such as ibuprofen, ketoprofen, naproxen, and the like, or other aromatic anti-inflammatory compounds such as indomethacin, indoprofen, a
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