| http://www.w3.org/ns/prov#value | - l; aryl radicals, for example phenyl or diphenyl, optionally substituted by 1, 2 or 3 alkyl radicals, e.g. of 1 to 12, preferably 1 to 6 carbon atoms, such as those alkyl radicals mentioned above and also tertiary alkyl radicals, such as tert. butyl, 2-methyl-2-butyl, 2,3-dimethyl-2-butyl, 2-methyl-2-pentyl, 3-methyl-3-pentyl, 3-ethyl-3-pentyl, 2,4-dimethyl-2-pentyl, 2-methyl-2-hexyl, 3-methyl-3-h
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