| http://www.w3.org/ns/prov#value | - A compound according to claim 17 wherein R5 is hydrogen; each R6 is selected from the group consisting of C1 -C2 alkyl, C1 -C2 alkoxy, chloro, fluoro, trifluoromethyl and mono- or di(C1 -C4)alkylamino; e is 1 or 2 and c is an integer of from 0 to 2.
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