1. Domagk, G., R. Behnisch, F. Mietzsch andH. Schmidt: Naturwiss.33, 315 (1946).
2. Hamre, D., J. Bernstein andR. Donovick: Proc. Soc. Exp. Biol. a. Med.73, 275 (1950).
3. Thompson, R. L., S. A. Milton, jr.,J. E. Officer andG. H. Hitchings: J. Immunology70, 229 (1953).
4. Wallace-Brockmann, R., J. Richard Thomson, J. Bell. Martella andE. Skipper Howard: Cancer Res.16, 167 (1956).
5. Methods of synthesis of these compounds are being published elsewhere.