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Five novel iridoid glycosides were isolated from the fresh whole plants of Verbascum thapsus L. (Scrophulariaceae). The structures of these iridoid glycosides were determined ont he basis of spectral and chemical evidence. These compounds were classified into two types : one iridoid glycosides contains ajugol, and the others contain 6-O-(α-L-rhamnopyranosyl)-catalpol in the structures.
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Warashina et al. (1991) studied this question.
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