| http://www.w3.org/ns/prov#value | - R3 and R4, which may be located on the vertices 4, 5, 6 or 7 of the azaindole ring-system provided that these vertices embody a carbon atom, each represent a hydrogen or halogen atom, more especially bromine or chlorine, or represent C1 to C6 alkyl, alkoxy or alkylthio or C3 to C8 cycloalkyl radicals;
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