| http://www.w3.org/ns/prov#value | - The radicals X are identical or different, preferably identical, and are each halogen, for example fluorine, chlorine, bromine, iodine, preferably chlorine, hydrogen, C1-C20-, preferably C1-C4-alkyl, C2-C20-, preferably C2-C4-alkenyl, C6-C22-, preferably C6-C10-aryl, an alkylaryl or arylalkyl group having from 1 to 10, preferably from 1 to 4, carbon atoms in the alkyl part and from 6 to 22, prefer
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