南方红豆杉Ｔａｘｕｓｍａｉｒｅｉ　Ｓ．Ｙ．Ｈｕ是生长在台湾中北部山区的一种常绿灌木，该植物的根在中国民间被用于治疗糖尿病。过去从根部曾分离出一系列具有６／８／６环状系统的二萜ｔａｘｕｍａｉｒｏｌｓＡ～Ｆ，现报道一种具有特殊的５／７／６环状系统新的二萜紫杉? Southern Taxus Taxusmairei S. Y. Hu is an evergreen shrub that grows in the mountains of central and northern Taiwan. The roots of this plant are used to treat diabetes in Chinese folk. In the past, a series of diterpenoid taxumairols A to F with a 6/8/6 toroidal system have been isolated from the roots. Now there is a report of a new diosgenin with a special 5/7/6 ring system.