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Su YP, Shen J, Xu Y, Zheng M, Yu CX. Preparative separation of alkaloids from Gelsemium elegans Benth. using pH-zone-refining counter-current chromatography. J Chromatogr A. 2011 Jun 10;1218(23):3695–8. doi: 10.1016/j.chroma.2011.04.025. PMID: 21543071. |