Two new geranylated xanthones, 6-O-methylcowanin (4) and oliverixanthone (5), along with five known compounds, cowanin, rubraxanthone, cowaxanthone, cowanol, and β- mangostin, have been isolated from the bark of Garcinia oliveri. For comparison of their biological activities, one mono-and seven di-O-alkylated α-mangostin derivatives were synthesized from α-mangostin. The structures of all compounds were assigned by ...
