| http://www.w3.org/ns/prov#value | - alkylthio groups to be substituted by one or more halogen atoms, in particular fluorine or chlorine, or (C.sub.3 -C.sub.6)-cycloalkyl which can be substituted by (C.sub.1 -C.sub.4)-alkyl, or denotes phenyl or phenoxy, it being possible for phenyl and
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