β-Carboline alkaloids from Picrasma quassioides

β-Carboline alkaloids from Picrasma quassioides Studies on the constituents of Picrasma quassioides BENNET. III. The alkaloidal constituents. Picrasidine-T, a dimeric β-carboline alkaloid from Picrasma quassioides Studies on the constituents of Picrasma quassioides BENNET. III. The alkaloidal constituents. Studies on the alkaloids from Picrasma quassioides Bennet. VII. Structures of .BETA.-carboline dimer alkaloids, picrasidines-H and -R. Studies on the alkaloids from Picrasma quassioides BENNET. IX. Structures of two .BETA.-carboline dimeric alkaloids, picrasidines-G and -S. Studies on the alkaloids from Picrasma quassioides Bennet. VII. Structures of .BETA.-carboline dimer alkaloids, picrasidines-H and -R. Studies on the alkaloids from Picrasma quassioides BENNET. IX. Structures of two .BETA.-carboline dimeric alkaloids, picrasidines-G and -S. Studies on the alkaloids from Picrasma quassioides Bennet. IV. Structures of picrasidines I, J, and K. Studies on the alkaloids from Picrasma quassioides Bennet. IV. Structures of picrasidines I, J, and K.