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According to the theory that similarities can be solvable easily in each other,nonpolar ethyl diol dimethyl ether is used to extract nonpolar compounds in ginkgo biloba leaves. 根據銀杏葉內不同有傚成分極性不一樣和相似相溶原理，選用乙二醇二甲醚這一非極性溶劑提取銀杏葉中非極性成分。