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High performamce liquid chromatography of naturally occurring xanthone. Pettel MJ and Hosteflmann K. Ibis . 1978
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Isolation of diploptene from Pyrrosin lingua Farwell. Takemoto T. et al. Chemical and Pharmaceutical Bulletin . 1963
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High-pressure liquid chromatography of naturally occuring xanthone. Hostetlmann K and McNair HM. Journal of Chromatography . 1976