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书剑如风: 金币+30, 翻译EPI+1 2015-09-12 07:46:28

The chloroform layer was collected and dried over anhydrous sodium sulfate, followed by concentrating in a rotary evaporator, and finally was purified by column chromatography with petroleum ether/ethyl acetate at a ratio of 5:3 (V:V) to obtain a white solid.

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