The isolation of cytochalasin E and cytochalasin K from Aspergillus clavatus is described. The structure of cytochalasin K, a new metabolite, has been determined by spectroscopic data and chemical reactions. The relationship between cytochalasin E and cytochalasin K was confirmed by chemical conversion. Chemical reactions on cytochalasins E and K, both of which contain the unique vinyl carbonate moiety, are described.

中文翻译：

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细胞松弛素E和K，来自曲霉菌的有毒代谢产物

描述了从蟹曲霉中分离细胞松弛素E和细胞松弛素K。细胞松弛素K（一种新的代谢产物）的结构已通过光谱数据和化学反应确定。通过化学转化证实了细胞松弛素E和细胞松弛素K之间的关系。描述了在细胞松弛素E和K上的化学反应，两者都含有独特的碳酸乙烯基酯部分。