1. J. A. V. Butler andB. E. Conway, J. chem. Soc. 1950, 3418.
2. J. A. V. Butler andK. A. Smith, Nature165, 847 (1950).
3. A more detailed description of the experimental conditions is given inK. Berneis, Helv. chim. Acta46, 57 (1963).
4. See alsoK. Berneis, M. Kofler, W. Bollag, andA. Langemann, Exper.19, 132 (1963). All experiments and the viscosity measurements were carried out at 37°C. As to the cytotoxic activity of the compound mentioned, seeP. Zeller, H. Gutmann, B. Hegedüs, A. Kaiser, A. Langemann, andM. Müller, Exper.19, 129 (1963).
5. W. Bollag andE. Grunberg, Exper.19, 130 (1963).