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Widia, W.; Ependi, E. .; Amelia, A. .; Candra, C.; Roanisca, O. . Cytotoxicity Activity of Ethanol Extract of Mentangor Stem Skin (Calophyllum Rufigemmatum) Against Breast Cancer Cells MCF-7 in Vitro: Chemistry. J. Pijar.MIPA 2023, 18, 72-76.