尿酸是人体嘌呤碱基分解代谢终产物，经肾脏排泄。

Uric acid as the end-product of purine metabolism in human body is excreted through kidney.

因此反应的中间产物为邻苯二甲酸，终产物为邻苯二甲酸酐、二氧化碳和水。

Therefore, the intermediate product is phthalic acid and final products are phthalic anhydride, carbon dioxide and water.

以枞酸为起点，合成了十二醇酯琥珀酸酐，采用红外光谱、核磁共振波谱及质谱对中间产物及终产物进行了结构表证。

Dodecanol abietate succinic anhydride was synthesized from abietic acid. The structures of products were characterized by spectrum of IR, HNMR and MS.