| http://www.w3.org/ns/prov#value | - The spacer compound Q and/or Q' preferably comprises optionally substituted saturated or unsaturated, branched or linear, C1-50 alkylene, cycloalkylene or aromatic group, optionally with one or more carbons within the chain being replaced with N, O or S, and wherein the optional substituents are selected from, for example, carbonyl, carboxy, hydroxy, amino and other groups.
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