The isolation of friedelin, putranjivadione (I), friedelanol and a new trieterpenoid Roxburgholone, C30H50O2, from the bark of P. roxburghii has been described. Roxburgholone has been shown to be 3α-hydroxyfriedelan-7-one (II). The hydroxyketone obtained by sodium borohydride reduction of putranjivadione (1) has been shown to be 3β-hydroxyfriedelan-7-one (XIII).
                                    木栓的(I)的分离,putranjivadione,friedelanol和一个新的trieterpenoid Roxburgholone,C 30 ħ 50 ö 2,从树皮P.莲已经描述。已经证明罗克伯霍酮是3α-羟基弗瑞德兰-7-一(II)。通过
硼氢化钠还原Putranjivadione(1)所获得的羟基酮已显示为3β-羟基Friedelan-7-one(XIII)。