Arimitsu, Kenji; Kajimoto, Tetsuya; Kimura, Hiroyuki; Ono, Masahiro; Ozeki, Minoru; Node, Manabu; Ohmomo, Yoshiro; Saji, Hideo; Yamashita, Masayuki Heterocycles, 2011, vol. 83, # 12 p. 2779 - 2802 doi: 10.3987/COM-11-12332