1. Allan, A. R. and Moffat, A. C., 1980, unpublished work.
2. Ardrey, R. E., Oon, M. C. H. and Moffat, A. C, 1979, unpublished work.
3. Baeyer, A. v., 1863, Ann., 127, 199. Quoted in Merck Index, 9th Edn., 1976, M. Windholt, (Ed.), p. 127, Merck, Sharp and Dohme, New Jersey.
4. Bayer, F. and Co., 1911, German Patent No. 247952. Quoted in Merck Index, 9th Edn., 1976, M. Windholt, (Ed.), p. 940, Merck, Sharp and Dohme, New Jersey.
5. Bowen, D. A. Ll. and Czajkowski, E., 1979, personal communication.