1. B. GANEM, Tetrahedron, 1978, 34, 3353
2. P.A. BARTLETT, Rec. Adv. Phytochem., 1986, 20, 119
3. K. DUNCAN, S. CHAUDHURI, M.S. CAMPBELL, J.R. COGGINS, Biochem. J. 1986, 238, 475
4. H. DUGAS, Bioorganic Chemistry, A chemical approach to enzyme action, Springer Verlag 2nd ed., 1989
5. C. WALSH, Tetrahedron, 1982, 38, 871