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Qualitative and quantitative determination of yohimbine in authentic yohimbe bark and in commercial aphrodisiacs by HPLC-UV-API/MS methods Zanolari, B.; Ndjoko, Kumbi Bénédicte; Ioset, J.R.; Marston, A.; Hostettmann, Kurt 2003
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Two New Tropane Alkaloids from the Bark of Erythroxylum vacciniifolium Mart. (Erythroxylaceae) Queiroz, E.F.; Zanolari, B.; Marston, Andrew; Guilet, David; ... Hostettmann, Kurt 2009