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A ring‐closing alkene metathesis (RCM)/ oxyselenation‐selenoxide elimination sequence was established to the sodium salts E‐ and Z‐25 of the originally proposed structure for the recently isolated cytotoxin aruncin B (1), as well as to the sodium salt Z‐34 of a related ethyl ether regioisomer; however, none of their corresponding free acids could be obtained. Their acid sensitivity, together with...
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