Bangangxanthone A and B, two xanthones from the stem bark of Garcinia polyantha Oliv. - Meli,A.L.; Komguem,J.; Ngounou,F.N.; Tangmouo,J.G.; Lontsi,D.; Ajaz,A.; Iqbal,M.C.; Ranjit,R.; Devkota,K.P.; Sondengam,B.L. (Phytochemistry, 2005)