| http://www.w3.org/ns/prov#value | - wherein A and B are different reactive groups and are as stated above; x and y are as stated above, and X and Y are additional spacer groups, for example, spacer groups having between 1 and 10 carbons such as between 1 and 6 carbons or between 1 and 4 carbons, and optionally containing one or more amide linkages, ether linkages, ester linkages and the like.
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