Two novel monoterpene alkaloids, dinklageine (1) and strychnovoline (2), derived from a new iridolactam skeleton, have been isolated from the leaves of Strychnos dinklagei. Their structures have been established by spectral analysis and their absolute stereochemistry determined by synthesis using loganin (3) as starting material. In addition, two other monoterpene alkaloids, gentianine and cantleyine, and a neutral product identified as the previously known monoterpene (12) have also been isolated. © 1985, American Chemical Society. Alle Rechte vorbehalten.