论文部分内容阅读
The title compound,4β,6α,9α-trimethy-2-carboxyltricyclo[6.3.0.0(4,5)]undec-2-ene,is a sesquiterpene which was first isolated from Ligularia caloxantha and characterized by MS and NMR.In addition,the structure was determined by X-ray single-crystal diffrac