Unusual Nitrogenous Derivatives from Alstonia

Unusual Nitrogenous Derivatives from Alstonia Angustimaline, an unusual nitrogenous compound from Alstonia angustifolia Angustilodine, an Unusual Pentacyclic Indole Alkaloid from <i>Alstonia</i> Angustilodine, an Unusual Pentacyclic Indole Alkaloid from Alstonia Alkaloids of Alstonia angustifolia Unusual spirocyclic macroline alkaloids, nitrogenous derivatives, and a cytotoxic bisindole from Alstonia Alkaloids of Alstonia angustifolia Unusual spirocyclic macroline alkaloids, nitrogenous derivatives, and a cytotoxic bisindole from Alstonia Indole Alkaloids fromAlstonia angustifolia Alstogustine and 19-epialstogustine, quaternary indole alkaloids from Alstonia angustifolia