Epple, Robert; Russo, Ross; Azimioara, Mihai; Cow, Christopher; Xie, Yongping; Wang, Xing; Wityak, John; Karanewsky, Don; Gerken, Andrea; Iskandar, Maya; Saez, Enrique; Martin Seidel; Tian, Shin-Shay Bioorganic and Medicinal Chemistry Letters, 2006, vol. 16, # 16 p. 4376 - 4380 doi: 10.1016/j.bmcl.2006.05.055