1. M. N. Galbraith, D. H. S. Horn, J. M. Sasse andD. Adamson, Chem. Commun.1970, 170.
2. S. Itô, M. Sunagawa, M. Kodama, H. Honma andT. Takahashi, Chem. Commun.1971, 91.
3. We are grateful to ProfessorS. Itô, Tohoku University, for this sample.
4. D. Adamson, V. H. K. Low andH. Adamson, inBiochemistry and Physiology of Plant Growth Substances (Eds.F. Wightman andG. Setterfield; Runge Press, Ottawa 1968), p. 505.
5. Molecular formulae of all new compounds were established by microanalysis.