Hypocrellutins A–C (1–3), 2- and 4-pyridone alkaloids, were isolated from cultures of the scale-insect pathogenic fungus Hypocrella discoidea BCC 71382. The structures were elucidated on the basis of NMR spectroscopic and mass spectrometry data. The absolute configuration of hypocrellutin B (2) was determined by ECD calculation. Their plausibly biosynthetic pathways are proposed. All isolated compounds were inactive in the antifungal, antimalarial, antitubercular, and cytotoxic activity assays.

中文翻译：

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鳞状病原真菌盘状菌Hypocrella discoidea BCC 71382的吡啶酮生物碱

Hypocrellutins A-C（1 - 3），2-和4-吡啶酮生物碱，是从鳞片昆虫致病性真菌的培养物中分离Hypocrella discoidea BCC 71382.的结构进行了阐明NMR光谱和质谱分析数据的基础上。通过ECD计算确定了降乳素B（2）的绝对构型。他们似乎合理的生物合成途径被提出。所有分离的化合物在抗真菌，抗疟疾，抗结核和细胞毒性活性测定中均无活性。