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对前文报导的羰基化合物采用柱层析、碱抽提、离子交换等方法进行了分离分析，并用ＧＣ－ＦＴＩＲ方法确定了其主要成分。
The carbonyl compounds reported previously were separated and analyzed by column chromatography, alkali extraction and ion exchange. The main constituents were identified by GC-FTIR.