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This paper describes the isolation and structure elucidation of two toxic tannins, named a-and ppunicalagin, from Terminalia oblongata, an Australian tree. Techniques used in the structure determination included Fast Atom Bombardment (FAB) mass spectrometry, and one-and twodimensional N M R, UV, and I R spectroscopy. A number of microscale derivatisations were performed, followed by FAB analysis.Methylation.-Component B (0.1 mg) was dissolved in diethyl ether (1 ml). A solution of diazomethane in diethyl ether Paper 0/00673D