natural products. Based on NMR guided isolation, three nitrogen-containing secondary metabolites, including two new compounds, variotin B (1) and coniosulfide E (2), together with a known compound, unguisin A (3), were isolated from the ethyl acetate (EtOAc) extract of the deep-sea fungus Aspergillus unguis IV17-109. The planar structures of 1 and 2 were elucidated by an extensive analysis of their spectroscopic
曲霉是众所周知的真菌
天然产物的第二大贡献者。基于 NMR 引导分离,从
乙酸乙酯( EtOAc ) 深海真菌Aspergillus unguis IV17-109 的
提取物。通过对其光谱数据(HRESIMS、1D 和 2D NMR)的广泛分析,阐明了1和2的平面结构。2的绝对配置通过将其旋光值与合成类似物的旋光值进行比较来确定。化合物2是一种罕见的天然存在的物质,具有不寻常的半胱
氨酸部分。此外,1显示出中等抗炎活性,IC 50值为 20.0 µM。这些结果表明,Aspergillus unguis可以产生结构多样的含氮次级代谢物,可用于进一步研究以寻找抗炎线索。