(untitled) - Hirama, M; Suttibut, C; Romauli Hutabarat, N D. M; Seki, C; Sakuta, N; Tsuchiya, T; Kohari, Y; Nakano, H; Uwai, K; Takano, N; Yasui, M; Okuyama, Y; Osone, K; Takeshita, M; Matsuyama, H (Heterocycles, 2012)