The intermediate 8‐(2‐hydroxybenzamido)octanoic acid, weighing 5 g, was placed into a small amount of isopropanol and stirred, and then a sodium hydroxide solution of 0.7 g was added dropwise. Subsequently, the remaining isopropanol (totaling 8 V) was also added. The mixture was slowly cooled with stirring to induce crystallization, and then filtered under suction. The resulting filter cake was rinsed with isopropanol and subsequently dried at 60°C for 2–4 h, yielding a 90.8% yield.
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