Two new 7,7'-bisdehydroaporphine alkaloids, 7,7'-bisdehydro-O-methylisopiline and 7-dehydronornuciferine-7'-dehydro-O-methylisopiline, and the known bisdehydroaporphine alkaloid, urabaine, have been isolated from the stem bark of Polyalthia bullata. Copyright (C) 1996 Elsevier Science Ltd