The known alkaloids zizyphine-A (1) and -B (2), abyssinine-A (4) and -B (5), and the previously undescribed zizyphine-C (3), -D (6) and -E (7) have been isolated from the stem bark of Zizyphus oenoplia. The structures of the new compounds were elucidated by spectroscopic methods applied to the alkaloids and to some of their transformation products, and by chemical degradation reactions. © 1974.