[1] Univ Wisconsin, Div Pharmaceut Sci, Madison, WI 53705 USA
[2] Univ Wisconsin, McArdle Lab Canc Res, Madison, WI 53705 USA
[3] Univ Wisconsin, Dept Chem, Madison, WI 53705 USA
[4] Yunnan Univ, Yunnan Inst Microbiol, Kunming 650091, Yunnan, Peoples R China
[5] Univ Wisconsin, Univ Wisconsin Natl Cooperat Drug Discovery Grp, Madison, WI 53705 USA
[6] Hunan Engn Res Ctr Combinatorial Biosynth & Nat P, Changsha 410329, Hunan, Peoples R China