Abstract: The fruit hull of mangosteen, Garcinia mangostana, has been used for many years as a medicine for treatment of skin infection, wounds and diarrhea. In the present study, ¹D ¹H NMR, ¹³C NMR, DEPT and 2D HMBC, HSQC, ¹H-¹H COSY, ROESY methods were used to identify the structure of 1, 3, 6-trihydroxy-7-methoxy-2, 8-bis-(3-methyl-2-butenyl)-9-xanthenone α-mangostin extracted from the fruit hull of mangosteen. The 1H and ¹³C chemical shifts of α-mangostin were assigned.

Key words: NMR, chemical shift, 2D NMR, mangostin, structure