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High-speed countercurrent chromatography as a valuable tool to isolate C-glycosylflavones from Cecropia lyratiloba Miquel.R. R. Oliveira; M. C. C. Moraes; R. O. Castilho; A. P. Valente; J. P. P. Carauta; D. Lopes; M. A. C. Kaplan · 2003