Natchus, Michael G.; Cheng, Menyan; Wahl, Christopher T.; Pikul, Stanislaw; Almstead, Neil G.; Bradley, Rimma S.; Taiwo, Yetunde O.; Mieling, Glen E.; Michelle Dunaway; Snider, Catherine E.; McIver, John M.; Barnett, Bobby L.; McPhail, Sara J.; Anastasio, Melanie B.; De, Biswanath Bioorganic and Medicinal Chemistry Letters, 1998, vol. 8, # 16 p. 2077 - 2080 doi: 10.1016/S0960-894X(98)00370-9