| http://www.w3.org/ns/prov#value | - In a fourth aspect, the polymer is characterized by a repeating unit having the formula ##STR5## or a copolymer thereof, wherein n is an integer, and R is H or a substituted or unsubstituted alkyl (e.g., having between 1 and 5 carbon atoms, inclusive), alkylamino (e.g., having between 1 and 5 carbons atoms, inclusive, such as ethylamino) or aryl group (e.g., phenyl).
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