Verbascoside B — A minor iridoid ofVerbascum georgicum
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By preparative PC of the previously purified total iridoid material followed by chromatography on a column of silica, a new minor iridoid — verbascoside B (I) — has been isolated in the form of an amorphous substance with [α]D −108 ± 4 (c 0.12; methanol). The structure of (I), corresponding to 6-α-L-rhamnopyranosyldecinnamoylglobularinin, has been shown on the basis of a passage from 6-α-L-rhamnopyranosylcatalpol and the spectral characteristics of (I) and of its nanoacetate (II). Characteristics of the IR and1H and13C spectra of (I) and (II) and of the mass spectrum of (II) are given.
KeywordsCaustic Soda Amorphous Substance Catalpol Aucubin Verbascoside
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