Chemical correlation of a degradation product of isoherqueinone with (–)-(S)-ethyl lactate has established that herqueinone and isoherqueinone have the R- and S-configuration, respectively, at the asymmetric centre in the side-chain; it follows that atrovenetin possesses the R-configuration.
J. S. Brooks and G. A. Morrison, J. Chem. Soc., Perkin Trans. 1, 1974, 2114 DOI: 10.1039/P19740002114
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