2,5,8-Tris(diphenylphosphoryl)- and 2,5,8-Tris (diphenylthiophosphoryl)-2,3,4,5,6,7,8,9-octahydro-1H-cyclopent [e]-asym-indacene-2,5,8-tricarbonitriles as a Novel Type of Polycondensed Systems

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