Suhara, Yoshitomo; Murakami, Aya; Kamao, Maya; Mimatsu, Shino; Nakagawa, Kimie; Tsugawa, Naoko; Okano, Toshio Bioorganic and Medicinal Chemistry Letters, 2007, vol. 17, # 6 p. 1622 - 1625 doi: 10.1016/j.bmcl.2006.12.082