5-Methoxy-1-oxo-tetrahydro-β-carboline, an alkaloid from Alstonia venenata

5-Methoxy-1-oxo-tetrahydro-β-carboline, an alkaloid from Alstonia venenata Studies on the constituents of Ailanthus altissima SWINGLE. III. The alkaloidal constituents. A New Alkaloid from the Roots of Alstonia angustifolia Studies on the constituents of Ailanthus altissima SWINGLE. III. The alkaloidal constituents. A New β-Carboline Alkaloid fromAilanthus altissima Studies on the constituents of Ailanthus altissima Swingle. II. Alkaloidal constituents. Studies on the constituents of Ailanthus altissima Swingle. II. Alkaloidal constituents. 14-Ketoalstonidine and Other Alkaloidal Constituents of the Stem Bark of Alstonia constricta Oxindole alkaloids from Alstonia macrophylla Alkaloids from the stem-bark of Alstonia macrophylla