Automated high-throughput system to fractionate plant natural products for drug discovery - Tu, Y; Jeffries, C; Ruan, H; Nelson, C; Smithson, D; Shelat, A A; Brown, K M; Li, X C; Hester, J P; Smillie, T; Khan, I A; Walker, L; Guy, K; Yan, B (J Nat Prod, 2010)