| http://www.w3.org/ns/prov#value | - wherein L1 and L2 are each independently leaving groups reactive with a nucleophilic group on a polymer or monomer, and Z1 is a group which may be essentially inert to reaction with a nucleophilic group on a polymer or monomer, or which may react with a nucleophilic group on a polymer or monomer at a slower rate than either of the leaving groups, L1 and L2.
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