1. F. Wiedemann, M. Thiel, K. Stach, E. Roesch, and K. Hardebeck, Ger. Offen. 1963152 (1971); Chem. Abs.,75, 76844 (1971).
2. S. Minami, T. Shono, and J. Matsumoto, Chem. Pharm. Bull.,19, No. 7, 1482 (1971).
3. J. P. Osselaere and C. L. Lapiere, Eur. J. Med. Chem. Chim. Ther.,9, 305 (1974); Chem. Abs., 82, 16766 (1975).
4. R. K. Robins and G. H. Hitchings, J. Am. Chem. Soc.,80, 3449 (1958).
5. V. Oakes, R. Pascoe, and H. N. Rydon, J. Chem. Soc., No. 4, 1045 (1956).