(±)-Quassidine K, a pair of cytotoxic bis-β-carboline alkaloid enantiomers from Picrasma quassioides

(±)-Quassidine K, a pair of cytotoxic bis-<b>β</b>-carboline alkaloid enantiomers from Picrasma quassioides (±)-Quassidines I and J, Two Pairs of Cytotoxic Bis-β-carboline Alkaloid Enantiomers from<i>Picrasma quassioides</i> Quassidines A−D, Bis-β-carboline Alkaloids from the Stems of <i>Picrasma quassioides</i> Quassidines A−D, Bis-β-carboline Alkaloids from the Stems of <i>Picrasma quassioides</i> Two new β-carboline alkaloids from the stems of Picrasma quassioides Seven Alkaloids from Picrasma quassioides and Their Cytotoxic Activities Enantiomeric β-carboline dimers from Picrasma quassioides and their anti-hepatoma potential 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. Effects of Enantiomerically Pure β-Carboline Alkaloids from Picrasma quassioides on Human Hepatoma Cells