Yakugaku Zasshi, , vol. 76, p. 1421 Chem.Abstr., , p. 6639 Yakugaku Zasshi, , vol. 78, p. 1079,1082 Chem.Abstr., , p. 5266 Memoirs of the Institute of Scientific and Industrial Research, Osaka University, , vol. 8, p. 168 Chem.Abstr., , p. 6648 Nippon Kagaku Zasshi, , vol. 72, p. 509,511 Memoirs of the Institute of Scientific and Industrial Research, Osaka University, , vol. 8, p. 168,170 Chem.Abstr., , p. 6648