(untitled) - Zhang, H J; Tamez, P A; Hoang, V D; Tan, G T; Hung, N V; Xuan, L T; Huong, L M; Cuong, N M; Thao, D T; Soejarto, D D; Fong, H H; Pezzuto, J M (J. Nat. Prod., 2001)