Nomura, Makoto; Shuto, Satoshi; Tanaka, Motohiro; Sasaki, Takuma; Mori, Shuichi; Shigeta, Shiro; Matsuda, Akira Journal of Medicinal Chemistry, 1999, vol. 42, # 15 p. 2901 - 2908 doi: 10.1021/jm990050i