Abstract
AbstractViburspiran (8), a structurally new member of the maleic anhydride natural products, was isolated, along with seven known compounds 9–15, from the fungal endophyte Cryptosporiopsis sp. The structure of the new compound was elucidated by spectroscopic methods and confirmed by single‐crystal X‐ray analysis. The absolute configuration was established by TDDFT CD calculations by using the solid‐state structure for input geometry. Viburspiran (8) is the first representative of a new class of eight‐membered maleic anhydride natural products, named octadrides and exhibited antifungal activity against Botrytis cinerea and Microbotryum violaceum.
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