Two antiproliferative saponins of Tarenna grevei from the Madagascar dry forest [1]

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Abstract

Antiproliferative bioassay-guided fractionation of the ethanol extract of the endemic Malagasy Rubiaceous plant Tarenna grevei led to the isolation of two new antiproliferative oxygenated oleanane triterpene saponins. The structures of the two active compounds were elucidated as 23-hydroxylongispinogenin 3-O-β-D-glucopyranoside (1) and longispinogenin 3-O-β-D-glucopyranosyl (1→2)-β-D-glucopyranoside (3) by analyses of their spectral data including 1D- and 2D-NMR spectroscopy and chemical evidence. Compounds 1 and 3 displayed moderate antiproliferative activity against the A2780 ovarian cancer cell line with IC50 values of 7.6 and 4 mM, respectively.

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Harinantenaina, L., Brodie, P. J., Callmander, M. W., Razafitsalama, L. J., Rasamison, V. E., Rakotobe, E., & Kingston, D. G. I. (2012). Two antiproliferative saponins of Tarenna grevei from the Madagascar dry forest [1]. Natural Product Communications, 7(6), 705–708. https://doi.org/10.1177/1934578x1200700604

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