| http://www.w3.org/ns/prov#value | - The radicals X are identical or different and are a hydrogen atom, a C1 -C10 -, preferably C1 -C4 -alkyl group, a C1 -C10 -, preferably C1 -C3 -alkoxy group, a C6 -C10 -, preferably C6 -C8 -aryl group, a C6 -C10 -, preferably C6 -C8 -aryloxy group, a C2 -C10 -, preferably C2 -C4 -alkenyl group, a C7 -C40 -, preferably C7 -C10 -arylalkyl group, a C7 -C40 -, preferably C7 -C12 -alkylaryl group, a C8
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