1. Department of Chemistry, Graduate School of Science Tohoku University, and CREST, Japan Science and Technology Corporation (JST), Sendai 980-8578, Japan Institute for Chemical Reactions, Tohoku University Sendai 980-8577, Japan, Center for Tsukuba Advanced Research Alliance, University of Tsukuba Tsukuba 305-8577, Japan, Suntory Institute for Bioorganic Research, Osaka 618-0024, Japan, Tokushima Research Center, Taiho Pharmaceutical Co. Ltd., Tokushima 771-0132, Japan, and Bristol-Myers Squibb...