Continuing the separation of the total alkaloids of the plant Papaver orientale L., collected in the flowering phase in the region of Lake Sevan, orientalidine, mecambridine, isothebaine, and bracteoline have been isolated, together with new alkaloids - oreintine, O-methylisothebaine, and orientidine, the structures of which have been established. © 1984 Plenum Publishing Corporation.