prov:value
| - The radicals X are identical or different and are each a hydrogen atom, a halogen atom such as fluorine, chlorine, bromine or iodine, a hydroxyl group, a C1-C10-alkyl group such as methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, hexyl or cyclohexyl, a C6-C15-aryl group such as phenyl or naphthyl, a C1-C10-alkoxy group such as methoxy, ethoxy or tert-butoxy, a C6-C15-ary
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