Watanabe, Toshihiro; Kakefuda, Akio; Tanaka, Akihiro; Takizawa, Kenji; Hirano, Seiko; Shibata, Hiroshi; Yamagiwa, Yoko; Yanagisawa, Isao
Chemical and Pharmaceutical Bulletin, 1998 , vol. 46, # 1 p. 53 - 68

Iyer, Subashree; Younker, Jarod M.; Czyryca, Przemyslaw G.; Hengge, Alvan C.
Bioorganic and Medicinal Chemistry Letters, 2004 , vol. 14, # 23 p. 5931 - 5935

Rosnati; Pueschner
Gazzetta Chimica Italiana, 1957 , vol. 87, p. 586,591