The histological research of male bai zhi showed that it had severe lignified while the tissues secereting the volatile oil and the coumarin ( secretory cavity ) were very little . the results of extractive test also showed that the principle constituent of male bai zhi was lower than the common evidently 公白芷的组织研究表明其木化程度高，而与挥发油和香豆素类成分密切相关的组织(分泌腔)又较少，白芷浸出物含量测定的结果也表明，公白芷中有效成分的含量明显低于一般白芷。
Hydroxyquinol triacetate was prepared from p - benzoquinone by 1 , 4 - addition reaction with acetic anhydride and then 6 , 7 - dihydroxy coumarin was synthesized from it by hydrolyze and cyclization in concentrated sulfuric acid . then 6 , 7 - dimethoxy coumarin was synthesized by methylating from 6 , 7 - dihydroxy coumarin with an overall yield of 74 . 4 % . the procedure was practical . its structure was confirmed by ir and 1hnmr 对苯醌与乙酸酐经1 , 4 -加成生成1 , 2 , 4 -苯三酚三乙酸酯,然后与苹果酸反应经水解、环合反应得6 , 7 -二羟基香豆素,再经甲基化得到6 , 7 -二甲氧基香豆素,总收率为74 . 4 % ,整个过程反应条件温和,操作方便,适合工业生产的要求,对产品结构进行了ir和1hnmr表征。
