| http://www.w3.org/ns/prov#value | - Such spacer arms are well known in the art and include, by way of example only, alkylene groups, aromatic groups, alkylaromatic groups, amido groups, amino groups, urea groups, carbamate groups, --R1 --Y--R2 -- groups where R1 and R2 are an alkylene groups (e.g., C1 -C6) and Y is oxygen or sulfur, and the like.
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