Affiliation: | (1) Department of Oncology, Merck Research Laboratories, Banyu Tsukuba Research Institute, 3 Okubo, Tsukuba Ibaraki, 300-2611, Japan;(2) Department of Chemistry, Merck Research Laboratories, Banyu Tsukuba Research Institute, 3 Okubo, Tsukuba Ibaraki, 300-2611, Japan;(3) Merck Research Laboratories, Banyu Tsukuba Research Institute, 3 Okubo, Tsukuba Ibaraki, 300-2611, Japan; |