| http://www.w3.org/ns/prov#value | - R7 and R8 are identical or different and are each hydrogen or an organic radical having from 1 to 40 carbon atoms, for example a cyclic, branched or unbranched C1-C20???, preferably C1-C8-alkyl radical, a C2-C20???, preferably C2-C8-alkenyl radical, a C6-C22???, preferably C6-C10-aryl radical, an alkylaryl or arylalkyl radical having from 1 to 10, preferably from 1 to 4, carbon atoms in the alkyl
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