Coarctatin, a metabolite of the fungus Chaetomium coarctatum, is shown by its spectroscopic properties to be 8-ethylidene-7,8-dihydro-4-methoxypyrano[4,3-b]pyran-2,5-dione (2). This structure has been confirmed by an X-ray analysis of the dibromo-derivative (3).
B. F. Burrows, W. B. Turner and E. R. H. Walker, J. Chem. Soc., Perkin Trans. 1, 1975, 999 DOI: 10.1039/P19750000999
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