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Rüffer, Martina and Ekundayo, O. and Nagakura, Naotaka and Zenk, Meinhart H. (1983): Biosynthesis of the protoberberine alkaloid jatrorrhizine. In: Tetrahedron Letters, Vol. 24, No. 26: pp. 2643-2644
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Abstract

Feeding experiments with distant single or doubly labelled precursors show that the methylene dioxy group of berberine is opened in the formation of jatrorrhizine.