Six alkaloids have been identified from the stem-bark ofTonduzia pittieri (Alstonia pittieri) collected in Guatemala. They consist of four new compounds; 11-methoxy-17-epivincamajine, 11-methoxyvincamajine, 18-hydroxycabucraline, 10-methoxy-11-[10-(11-methoxylvincamajinyl)]-cathafoline, and of two known compounds, cabucraline and akuammine. © 1990 Pergamon Press plc.