Structures and absolute stereochemistry of (-)-echitoveniline, (-)-11-methoxyechitoveniline and (-)-11-methoxyechitovenedine, three new indole alkaloids of the vincadifformine type, isolated from the fruits and leaves of Alstonia venenata R.Br., have been established as 3b, 3c and 3d, respectively, on the basis of spectral and chemical evidence. A plausible mechanism of the LAH reduction of the δ-lactones8b and8c to the corresponding diols 9b and 9c has been discussed. © 1979.