1) A part of this study was presented at the 97th Annual Meeting of the Pharmaceutical Society of Japan, Tokyo, April 1977 (Abstr., p. 265) and at the 98th Annual Meeting of the Pharmaceutical Society of Japan, Okayama, April 1978 (Abstr., p. 339).
2) E. S. Stern, “The Alkaloids,” Vol. IV, ed by R. H. F. Manske, Academic Press New York (1954), p. 303.
3) H. Suginome, Ann., 533, 172 (1938).
4) W. A. Jacobs and L. C. Craig, J. Biol. Chem., 136, 323 (1940).