TETRAOXYGENATED XANTHONES FROM ANTIOXIDANT ACTIVE FRACTION OF THE STEMBARK OF Garcinia forbesii KING - , Madyawati Latief, Supriyatna Soetardjo, Husein H. Bahti, dan Dac ([Yogyakarta] : Fak. MIPA Universitas Gadjah Mada, 2007)