7,8β-Dihydroponasterone A, a new phytoecdysteroid from the needles of the Japanese yew, Taxus cuspidata. - Shi,Q.W.; Dong,M.; Huo,C.H.; Su,X.H.; Li,X.; Yamada,T.; Kiyota,H. (J Braz Chem Soc, 2007)