Tannins and Related Compounds. XLI. : Isolation and Characterization of Novel Ellagitannins, Punicacorteins A, B, C, and D, and Punigluconin from the Bark of Punica granatum L. Tanaka Takashi, Nonaka Gen-Ichiro and Nishioka Itsuo, Chemical & pharmaceutical bulletin, 1986-02-25, 34(2), pages 656-663 (abstract)