| http://www.w3.org/ns/prov#value | - trifluoromethyl, (C.sub.1 -C.sub.4)-alkyl, (C.sub.1 -C.sub.4)-alkoxy or (C.sub.1 -C.sub.4)-alkylthio, it being possible for the alkyl, alkoxy and alkylthio groups to be substituted by one or more halogen atoms, in particular fluorine or chlorine, or
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