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Original version
Wöldecke, M.; Herrmann, K.: D-(+)-Dikaffeoyl-Weinsäure aus Endivien (Cichorium endivia L.). In: Zeitschrift für Naturforschung - Section C Journal of Biosciences 29 (1974), Nr. 7-8, S. 360-361. DOI: https://doi.org/10.1515/znc-1974-7-809
The predominant caffeic acid compound of endives has been crystallized after column chromatography on polyamide and cellulose and was identified as ᴅ -(+) -dicaffeoyl tartaric acid.