| http://www.w3.org/ns/prov#value | - R.sub.8 and R.sub.10 independently of one another are preferably hydrogen or C.sub.1 -C.sub.4 alkyl, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl or tert-butyl and particularly preferably hydrogen, methyl or ethyl.
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