Four newtaxoids [147 were isolated from the roots of Tmw yunnanensis. Three of the new compounds were analogues of taxuyunnanine C and the fourth was a 2 deacetoxytaxuyunnanine C derivative. The structures were elucidated by specrroscopic methods.Since the discovery of the natural product paclitaxel (=Taxol@) (1) and its clinically useful anticancer activity, investigations on Taxus spp. have brought more than one hundred new compounds into the taxane diterpenoid family (2). However, much of this work has concentrated on the needles because they can be collected without destruction of the trees and on the bark because of its high paclitaxel content. Work on the roots has been largely ignored, but our study on the roots of T. yunmnenris C.Y. Cheng, W.C. Cheng & L.K. Fu (Taxaceae) showed that they were rich in taxane diterpenoids, including paclitaxel (3-5). In continuation of this research, we report herein four additional new taxoids, named taxuyunnanines G 111, H 127, I 137, and J 147, respectively, from an extract reported previously. All four compounds lack oxygenated substituents at C-13 but possess P-oxygenated substituents at C-14, and compound 4 is the second example of a natural taxoid having only three oxygenated sites in its skeleton. In addition, compounds 2 and 3 contain an uncommon isobutyrate group and a propionyloxy group, respectively, which have been reported to exist in compounds produced from cultures of T. chinensis var. muirei (6).