Ikeda et al. Kanazawa Daigaku Yakugakubu Kenkyu Nempo, 1956 , vol. 6, p. 48,50 Kanazawa Daigaku Yakugakubu Kenkyu Nempo, 1957 , vol. 7, p. 64 Chem.Abstr., 1957 , p. 4349,1958 9025