Increasing attention has recently been given to a new class of sulfur-containing heterocyclic compounds, 1, Zdithiins (1, 2-dithia-3, 5-cyclohexadienes), due to their unique structure and a wide range of biological activity.'Since the first isolations of 1, Zdithiin compounds from the roots of Eriophyllum caespitosum D o~ gl.~,~ and Ambrosia eliator L. 3 by Mortensen in 1964* and Bohlmann in 1965, 3 nearly a dozen 1, Zdithiins have been isolated from a ...