Toxic tetranortriterpenes of the fruit of Melia azedarach: Oelrichs, P. B. Hill, M. W., Vallely, P. J., MacLleod, J. K. and Molinski, T. F. (Department of Primary Industries, Animal Research Institute, Yeerongpilly, Queensland 4105, and Research School of Chemistry, Australian National University, P.O. Box 4, Canberra, A.C.T. 2600, Australia) Phytochemistry22, 531 (1983)