From the stem bark of Teclea ouabanguiensis Aubrev. & Perr. (Rutaceae), six furoquinoline alkaloids have been isolated and characterized. Previously known alkaloids, but new to this plant, were tecleaverdoomine (1), tecleine (3), flindersiamine (4), montrifoline (nkolbisine) ( 5) and kokusaginine (6), while tecleamine 2 is reported from a natural source for the first time. Spectroscopic and chemidal evidence is presented for the structure of the new isolate 2.

The stem bark of Teclea ouabanguiensis has yielded six triterpenoids, two of which are new. The known compounds were identified spectroscopically as 7-deacetylazadirone (2), 7-deacetylproceranone (3), tecleanin, (4), and lupeol. The novel compounds include the tetranortriterpenoids, 7-deacetoxy-7-oxoazadirone (1), and ouabanginone (5). The biogenetic significance of the presence of these limonoids in T. ouabanguienis is discussed.