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During this period mainly the extraction of natural products, and the development of a large number of bulk drugs and pharmaceutical intermediates projects. General natural products extraction and separation methods (such as commonly used solvent extraction, supercritical extraction, ultrasonic promote mentioning the liquid-liquid extraction, column chromatography, preparative chromatography, gel chromatography, atmospheric vacuum distillation, distillation molecular distillation, precipitation, crystallization, etc.) has done some research. Many years engaged in the work of organic chemistry at the same time, have a more comprehensive understanding of all aspects of the organic compounds. Comprehensive understanding of various structural identification of organic compounds, natural products commonly used methods such as LC / GC-Ms, HNMR, IR, DSC, element analysis, optical rotation measurement.
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