Itoh, Ken-Ichi; Aoyama, Tadashi; Satoh, Hiroaki; Hasegawa, Kenta; Meguro, Natsumi; Horiuchi, Akira C.; Takido, Toshio; Kodomari, Mitsuo Heterocycles, 2014 , vol. 89, # 6 p. 1473 - 1482