Watanabe, Kazutoshi; Morinaka, Yasuhiro; Hayashi, Yoshio; Shinoda, Masaki; Nishi, Hiroyoshi; Fukushima, Nobuko; Watanabe, Toshiaki; Ishibashi, Akira; Yuki, Satoshi; Tanaka, Masahiko
Bioorganic and Medicinal Chemistry Letters, 2008 , vol. 18, # 4 p. 1478 - 1483

Hannig,E.; Schobess,B.
Pharmazie, 1960 , vol. 15, p. 615 - 617