The unique hydrated biscyclohexenetrione structures (1)–(4) of carpinins A–D, the metabolites of hexahydroxydiphenic acid esters (ellagitannins) isolated from the leaves of Carpinus japonica, are described.
G. Nonaka, K. Mihashi and I. Nishioka, J. Chem. Soc., Chem. Commun., 1990, 790 DOI: 10.1039/C39900000790
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