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Tetrahedron Letters
Volume 45, Issue 42, 11 October 2004, Pages 7943-7946
Selective synthesis, structure and oxidation properties of isomeric 1,4-dithiins fused to two benzothiophenes
Tatsuya Yamamotoa, Satoshi Ogawaa and Ryu Sato
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http://dx.doi.org/10.1016/j.tetlet.2004.08.138