Cytotoxic constituents of the roots of Ekmanianthe longiflora - Peraza-Sánchez,S.R.; Chávez,D.; Chai,H.-B.; Shin,Y.G.; García,R.; Mejía,M.; Fairchild,C.R.; Lane,K.E.; Menendez,A.T.; Farnsworth,N.R.; Cordell,G.A.; Pezzuto,J.M.; et al. (Journal of Natural Products, 2000)