| http://www.w3.org/ns/prov#value | - or a copolymer thereof, wherein n is an integer, and R is H or a lower alkyl (e.g., having between 1 and 5 carbon atoms, inclusive), alkyl amino (e.g., having between 1 and 5 carbons atoms, inclusive, such as ethylamino) or aryl group (e.g., phenyl); a first repeating unit having the formula
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