The appropriate reaction conditions of cyclization reaction: NaOEt was 1.4 mole eq.

合环反应的条件为：乙醇钠的用量为1.4摩尔当量；

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The results indicated that the esterified yield was above 97% under the appropriate reaction conditions.

结果表明，在最适宜的反应条件下，酯化率在97%以上。

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The yield and purity of simetryne reach 73.57% and 89.52% respectively under appropriate reaction conditions.

在适宜的反应条件下，西草净的收率和纯度分别为73.57%和89.52%。

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