Abstract
A strain of Seiridium cupressi, a fungus causing a canker disease of cypress ( Cupressus sempervirens) in Greece, produces several phytotoxins in culture. Two of them were identified as seiridin and iso-seiridin, the butenolides previously isolated from another cypress pathogen, S. cardinale. A third phytotoxin, which is present in small amounts in the culture filtrates of S. cupressi and is not produced by S. cardinale, was identified as a new macrolide which we have called seiricuprolide. Its structure was established by spectroscopic analysis of the metabolite and of some key derivatives.
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