Chemical and Biological Investigation of Araucaria heterophylla Salisb. Resin

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<jats:p>Three labdane diterpenes, namely labda-8(17),14-diene, 13-epicupressic acid, and 13-Oacetyl- 13-epicupressic acid, were isolated from the resin collected from stem exudates of Araucaria heterophylla Salisb. (Araucariaceae). The isolated compounds were identified using different spectroscopic methods (<jats:sup>1</jats:sup>H NMR, <jats:sup>13</jats:sup>C NMR, HMQC, HMBC and COSY). The resin extract showed antiulcerogenic activity against ethanol-induced stomach ulcers in Sprauge Dawely rats using ranitidine as standard. In addition, the resin and the isolated compounds showed variable cytotoxic activities against breast (MCF7) and colon (HCT116) cancer cell lines.</jats:p>

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