In continuation of our studies on the constituents of Taxus brevifolia Nutt. (1), we have investigated a fraction obtained during large-scale extraction and purification of T. brevifolia bark (2). This fraction, designated FB 10115-H, was eluted from a silica column before taxol and was found to contain the two taxane diterpenes 1 and 3 as its major constituents. © 1986, American Chemical Society. All rights reserved.