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Sinenxan H [2α,14β -diacetoxytaxa-4(20),11-diene-5α, 10β -diol, 1] was isolated from the heartwood of Taxus cuspidata, for the first time from natural sources. Compound 1 was found to be readily converted into 2α-acetoxytaxa-4(20),10,12(18),13-tetraen-5α-ol (2), the first example of a taxane with 10,11-and/or 13,14-double bond(s) and a conjugated triene system, in CDCl 3 .doi:10.5560/znb.2011.66b0759 fatcat:e6ysaglcrrgjzockmd3egqgwlm