(untitled) - Seki, C; Hirama, M; Hutabarat, N D. M. R; Takada, J; Suttibut, C; Takahashi, H; Takaguchi, T; Kohari, Y; Nakano, H; Uwai, K; Takano, N; Yasui, M; Okuyama, Y; Takeshita, M; Matsuyama, H (Tetrahedron, 2012)