The structure (IIa) of maesaquinone, a benzoquinone from Maesa japonica MORITZI, proposed by Hiramoto, 5, 6) was further confirmed by spectral evidences, gas chromatography of the oxidation products, and an improved synthesis of the dihydro derivative (IIb). Isolation of monoacetate (VIIa) of IIa from the fruits suggested that VIIa is the chief component of the fruits.
                                    来自Maesa japonica MORITZI的苯醌maesaquinone的结构(IIa)由HiraMOto提出,进一步通过光谱证据、氧化产物的气相色谱以及二氢衍
生物(IIb)的改良合成得到了确认。从果实中分离出的IIa的单
醋酸酯(VIIa)表明,VIIa是果实的主要成分。