A new sesquiterpene, 10,11-dihydrocyclonerotriol (1), together with two known compounds, catenioblin C (2) and sohirnone A (3), were isolated from Trichoderma longibrachiatum YM311505, an endophytic fungus of Azadirachta indica. Their structures were characterized and identified by spectral analysis. Compounds 1–3 exhibited antifungal activities against Pyricularia oryzae and Candida albicans.
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