From the methanolic extract of the rhizome of Rehmannia glutinosa LIBOSCH. forma hueichingensis HSIAO, sucrose and catalpol (I) (0.11% from the fresh rhizome) were isolated and identified, in addition to D-mannitol. A comment on the pharmacological significance of catalpol in relation to the medicinal purpose of the rhizome was made.
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Kitagawa et al. (1971) studied this question.
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