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        "http://www.w3.org/ns/prov#value" : [ "odine, preferably fluorine or chlorine. [0045] Preferred compounds are compounds of formula I wherein X1 and X2 are CH. [0046] A further embodiment of the invention is a pharmaceutical composition containing as an active ingredient a compound of formula I [0047] or a pharmaceutically acceptable salt or prodrug thereof, [0048] wherein [0049] X1 and X2 are each independently selected from a CH group" ] ,
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