| http://www.w3.org/ns/prov#value | - ably represents hydrogen, fluorine, chlorine, bromine, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy.W particularly preferably represents hydrogen, nitro, cyano, fluorine, chlorine, bromine, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.2 -halogenoalkyl, C.sub.1 -C.sub.2 -halogenoalkoxy or particularly preferably representsin each case optionally fluorine-, chlorine-, bro
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