1. Natural;Money;Prod,1985
2. ibid;Oppolzer;Tetrahedron,1987
3. fl Pure a by ibid ibid der a;Oppolzer;Chim Acta Chem Chirality Tetrahedron Lett Tetrahedron Chim Acta Chim Acta,1984
4. unpublished work;Oppolzer;Tetrahedron Lett,1986
5. in press;Oppolzer;Am Chem SOC,1990