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Abstract
Four new pentacyclic triterpene saponins, philoxeroidesides A–D (1–4) were isolated from the aerial parts of Alternanthera philoxeroides. Their structures were elucidated on the basis of 1D- and 2D-NMR experiments and MS analyses. Philoxeroidesides A–D (1–4) showed cytotoxic activities against SK-N-SH and HL60 cell lines.