A set of two diastereomers of phenylcyano glycosides, (7S)- and (7R)-phenylcyanomethyl 1′-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (1, 2), were isolated from the methanol extract of dried vines of P. quadrangularis. The absolute configurations of the benzylic methine centers were determined mainly by the comparison of 13C NMR spectra of these compounds, prunasin (3) and sambunigrin (4), of which the last two cyanoglycosides are known to have (R)- and (S)-configurations, respectively.
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