1. 1) Presented at the 1st IUPAC Symposium on The Chemistry of Natural Products, Sydney, Aug., 1960.
2. 2) J. Iwasa, Z. Kumazawa and M. Nakajima, The 4th Symposium on The Organic Chemistry of Natural Products, Kyoto, Oct., 1960.
3. 3) J. Iwasa, Z. Kumazawa and M. Nakajima, Chem. and Ind., 1961, 511.
4. 4) J. Iwasa, Z. Kumazawa and M. Nakajima, This Journal, 25, 782 (1961).
5. 5) W. H. Perkin and A. E. Smith, J. Chem. Soc., 83, 8 (1903).