prov:value
| - R9, R10, R11 and R12 are identical or different and are each hydrogen, halogen such as fluorine, chlorine, bromine or iodine, preferably fluorine, 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 a C2-C8-alkenyl radical, a C6-C22???, preferably C6-C10-aryl radical, an alkylaryl or
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