| http://www.w3.org/ns/prov#value | - R.sub.3 is preferably hydrogen, C.sub.1 -C.sub.4 alkyl, --OH, C.sub.6 -C.sub.12 alkoxy, C.sub.5 -C.sub.8 cycloalkoxy, allyl, benzyl or acetyl, in particular hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.5 -C.sub.8 cycloalkoxy, for example hydrogen,
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