Methods: Suberic acid was selected as the start material, and the SAHA was obtained through condensation, activation and ammoniated.

方法：以辛二酸为起始原料，经缩合、活化、氨解合成SAHA。

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Preferably, the carboxylic acid raw material contains glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid and 1,9-nanomethylenedicarboxylic acid in a total amount of 5 mass% or less.

所述羧酸 原料含有总量小于或等于5质量％的戊二酸、己二酸、庚二酸、辛二酸、 癸二酸和1，9-亚壬基二羧酸。

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