| http://www.w3.org/ns/prov#value | - In accordance with this invention, there are provided novel chalcogen organic compounds represented by the formula: S Se L. I wherein R is selected from divalent hydrocarbylene radicals of from to 50 carbon atoms, divalent heterocyclic, alicyclic and aromatic radicals having from 3 to 50 carbon atoms, n is a positive integer and X is the radical SeR- Se-; linear polymers comprising recurring units
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