| http://www.w3.org/ns/prov#value | - bstituted heterocyclyl, preferably containing from 5 to 7 nuclear carbon and heteroatoms such as S, N, P or O, examples of preferred heterocyclyl groups being pyridyl, quinolyl, imidazolyl and thienyl; a carboxyl group; or a carboxyalkyl group, the alkyl portion of which preferably contains from 1 to 8 carbon atoms.
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