1. [1a] Some of these data were presented at the 32th Symposium on the Chemistry of Natural Products, Symposium Papers, p. 304, Chiba, Japan, October 1990.
2. [1b] – Part VI: ref.[2b].
3. [2a] , , Liebigs Ann. Chem. 1992, 453–459.
4. [2b] – , , Liebigs Ann. Chem. 1992, 575–579.
5. [2c] – , , Liebigs Ann. Chem. 1986, 638–646.