| http://www.w3.org/ns/prov#value | - being optionally substituted by alakyl of from 1 to 4 carbon atoms, especially methyl, halogen, especially chlorine, haloalkyl of from 1 or 2 carbon atoms and 1 to 5 halogen atoms, especially chlorine or fluorine, or nitro),optionally substituted aryl of from 6 to 10 carbon atoms, especially phenyl, and aralkyl of from 1 or 2 carbon atoms in the alkylene moiety and 6 to 10 carbon atoms in the aryl
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