Abstract
Bioassay-guided fractionation of the fruits of Piper longum afforded two new minor amides, piperlongimin A (2) [2E-N-isobutyl-hexadecenamide] and piperlongimin B (4) [2E-octadecenoylpiperidine] together with five known compounds with moderate cytotoxic activity. The structures were elucidated on the basis of spectroscopic evidences. All these compounds inhibited cell proliferation of human leukemia, HL-60 cell lines, and displayed major apoptosis-inducing effects.
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