1. Mitra. A.K., Arnott, S., Isaac, D.H. & Atkins, E.D.T. J. molec. Biol. 169, 873–901 (1983).
2. Eliel, E.L., Allinger, N.L., Angyal, S.J. & Morrison, G.A. Conformational Analysis, 370 (Wiley, New York, 1965).
3. Perlin, A.S., Casu, B., Sanderson, G.R. & Tse, J. Carbohydrate Res. 21, 123–132 (1972).
4. Csiner, D.G., Stevens, E.S., Morris, E.R. & Rees, D.A. J. Am. chem. Soc. (in the press).
5. Scott, J.E. & Tigwell, M.J. Biochem. J. 173, 103–114 (1978).