Tsukamoto; Hisada; Nishibe
Chemical and Pharmaceutical Bulletin, 1985 , vol. 33, # 9 p. 4069 - 4073

Narantuyaa, S.; Batsuren, D.; Batirov, E. Kh.; Malikov, V. M.
Chemistry of Natural Compounds, 1986 , vol. 22, # 2 p. 228 - 229
Khimiya Prirodnykh Soedinenii, 1986 , # 2 p. 243 - 244