| http://www.w3.org/ns/prov#value | - R8 is alkoxy of 1 to 8, preferably 1 to 4, carbon atoms, such as ethoxy or methoxy, with or without alkoxy of 1 to 4 carbon atoms as substituent, alkyl of 1 to 8, preferably 1 to 4, carbon atoms, such as ethyl or methyl, alkenyl of 2 to 8, preferably 2 to 4, carbon atoms or phenylenealkyl where the alkyl radical has 1 to 4 carbon atoms and the phenylene radical may be substituted by substituents s
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