作者:J.A. Giles、J.N. Schumacher                                    
                                    
                                        DOI:10.1016/s0040-4020(01)92174-x
                                    
                                    
                                        日期:1961.1
                                    
                                    Two hitherto unknown diterpene lactones have been isolated from Turkish tobacco. Characterization studies show that these compounds, now called α- and β-levantenolides, are represented by I and II. The levantenolides differ only in being epimeric at C12, and are closely related to labdanolic acid.
                                    从土耳其烟草中分离出了两种迄今未知的二萜内酯。表征研究表明,这些化合物(现在称为α-和β-左旋烯内酯)以I和II表示。黎万特内酯的区别仅在于在C 12上是差向异构体,并且与拉丹酸密切相关。