Abstract
Bioassay-guided fractionation of cytotoxic of methanol extract of the seeds of Annona cherimola provided two novel cyclic peptides, cherimolacyclopeptide E ( 1) and cherimolacyclopeptide F ( 2), which exhibited significant cytotoxic activity against the KB (human nasopharyngeal carcinoma) cell culture system. The peptide 1 and 2 were elucidated by MS/MS fragmentation experiments using a Q-TOF mass spectrometer equipped with an ESI source, extensive 2D NMR analyses and chemical degradation.
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