(untitled) - Ashton,P.R.; Bartsch,R.A.; Cantrill,S.J.; Hanes,R.E.; Hickingbotton,S.K.; Lowe,J.N.; Preece,J.A.; Stoddart,J.F.; Talanov,V.S.; Wang,Z.-H. (Tetrahedron Lett., 1999)