Journal
JOURNAL OF NATURAL PRODUCTS
Volume 79, Issue 1, Pages 230-239Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.5b00992
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Funding
- University of Malaya (UMRG)
- MOHE Malaysia [HIR-F005]
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Eleven new indole alkaloids (1-11) comprising seven aspidofractinine and four eburnane alkaloids, were isolated from the stem-bark extract of Kopsia pauciflora occurring in Malaysian Borneo. The aspidofractinine alkaloids include a ring-contracted, an additional ring-fused, a paucidactine regioisomer, two paucidactine, and one kopsine alkaloid. The structures of several of these alkaloids were also confirmed by X-ray diffraction analyses. The bisindole alkaloids isolated, norpleiomutine and kopsoffinol, showed in vitro growth inhibitory activity against human PC-3, HCT-116, MCF-7, and A549 cells and moderate effects in reversing multidrug-resistance in vincristine-resistant human KB cells.
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