Evaporation gave 4.48 g of a clear liquid, which was further purified by recrystallization from hexane/acetone (95:5) to obtain 3.52 g of the
acid derivative as white crystals (72.9%).
A clear liquid(4.48 g) was obtained by evaporation, further being purified by recrystallization in hexane/acetone (95:5), and the yield of the acid derivative with white crystals was 72.9%（3.52g）.
Evaporation gave a clear liquid(4.48 g), which was further purified by recrystallization from hexane/acetone (95:5) to obtain the acid derivative as white crystals (3.52 g ,72.9%).
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