溶剂经过蒸发后,渣体物质析出.在其中加入乙酸乙酯后的混合物经过水洗,会逐渐凝结一层有机层；而在其中加入石油醚,会有晶体析出,然后分离出少量化合物.
求翻译Ethyl acetate was added to the residue prepared by evapor
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