1. Chibnall, A. C., Piper, S. H., Pollard, A., Williams, E. F., and Sahai, P. N., Biochem. J., 28, 2189 (1934). Kosak, A. I., Swinehart, J. S., and Taber, D., J. Nat. Cancer Inst., 17, 375 (1956). Trillat, J. J., Cuzin, J., Tertiou, L., and Mihama, K., Bull. Microscop. App., 8, 64 (1958). Dymicky, M., and Stedman, R. L., Tobacco Sci., 3, 60 (1959). Cuzin, J. L., Thoi, Le Van, and Morell, S., Proc. Second Int. Sci. Tob. Congress, Brussels, p. 507 (1958).
2. Van Duuren, B. L., and Kosak, A. I., J. Org. Chem., 23, 473 (1958).
3. Wynder, E. L., and Wright, G., Cancer, 10, 255 (1957).
4. Hukushima, Y., and Ooike, K., J. Chem. Soc. Japan, 61, 1297 (1940); 62, 413 (1941); Chem. Abstr., 36, 7240 (1942). Gladding, R. N., and Wright, H. E., Tobacco Sci., 3, 81 (1959). For references to earlier claims, see Kosak, Swinehart and Taber (loc. cit.) and Chibnall et al. (loc. cit.).
5. Clemo, G. R., Tetrahedron, 3, 168 (1958).