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Antitumor Activity of Leaves of Himatanthus Drasticus (Mart.) Plumel-Apocynaceae (janaguba) in the Treatment of Sarcoma 180 Tumor . Braz. J. Pharm. Sci. 2010, 46 (2), 199-203. https://doi.org/10.1590/S1984-82502010000200005.