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The 2,5-diaryl tetrahydrofurans and tetrahydrothiophenes disclosed herein can be prepared in a variety of ways known to those skilled in the art, including by methods disclosed in or obvious in view of methods disclosed in U.S. Pat. Nos. 4,539,332, 4,757,084, 4,996,203 and 5,001,123, and European Patent Application Nos. 90306234.7, 90306235.4, and 89202593.3.
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