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Mulyadi Tanjung and Tjitjik Srie Tjahjandarie and Ratih Dewi Saputri and Baharrani Dwi Kurni and Muhammad Faisal Rachman and Yana Maolana Syah (2019) Calotetrapterins A-C, three new pyranoxanthones and their cytotoxicity from the stem bark of Calophyllum tetrapterum Miq. Natural Product Research, 33 (23). pp. 36-42. ISSN 1478-6427