Two new solanapyrone analogues, solanapyrones N and O (1 and 2, resp.), and three known compounds, solanapyrone C (3), nigrosporalactone (4), and phomalactone (5), were isolated from the fermentation culture of Nigrospora sp. YB-141, an endophytic fungus isolated from Azadirachta indica A. Juss. The structures of the new compounds were elucidated on the basis of spectroscopic analysis. The antifungal activities of 1-5 towards seven phytopathogenic fungi were tested. Most of the compounds exhibited no or only weak antifungal activities.

中文翻译：

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来自内生真菌Nigrospora sp。的两个新的solanapyrone类似物。印度印za的YB-141。

从Nigrospora sp。的发酵培养物中分离出两个新的solanapyrone类似物solanapyrones N和O（分别为1和2）和三个已知化合物solanapyrone C（3），nigrosporalactone（4）和phomalactone（5）。YB-141，从印度印A（Azadirachta indica A.Juss）分离的内生真菌。在光谱分析的基础上阐明了新化合物的结构。测试了1-5对7种植物病原真菌的抗真菌活性。大多数化合物没有或只有很弱的抗真菌活性。