以下为句子列表：
英文: A wide variety of natural products, e. g. alkaloids, β-lactames, biotin, amino sugars has been synthesized by 1, 3-dipolar cycloaddition reaction between nitrones and alkenes.
中文: 摘要通过硝酮与烯烃化合物的1，3-偶极环加成反应合成了许多天然産物，如生物硷、β-内酰胺、生物素、氨基糖等。
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英文: Abstract: A wide variety of natural products, e.g. alkaloids, β-lactames, biotin, amino sugars has been synthesized by 1,3-dipolar cycloaddition reaction between nitrones and alkenes.
中文: 文摘:通过硝酮与烯烃化合物的1，3-偶极环加成反应合成了许多天然产物，如生物碱、β-内酰胺、生物素、氨基糖等。
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英文: As a new technology applied in the separation of liquid, molecular distillation is widely used in many fields such as Chinese herbal medicines, natural products, food and chemical industry.
中文: 摘要分子蒸馏技术是一种新型液－液分离技术，现已广泛应用于很多领域。
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英文: Coal and oil are natural products.
中文: 煤和石油是天然物产。
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英文: Combinatorial chemistry is now playing important role in the research of the natural products.
中文: 组合化学技术在天然产物的研究中起著越来越重要的作用。
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