(untitled) - Singh,S.B.; Zink,D.L.; Liesch,J.M.; Goetz,M.A.; Jenkins,R.G.; Nalin-Omstead,M.; Silverman,K.C.; Bills,G.F.; Mosley,R.T.; Gibbs,J.B.; Albers-Schonberg,G.; Lingham,R.B. (Tetrahedron, 1993)