Tannins and Related Compounds. XCIII. : Occurrence of Enantiomeric Proanthocyanidins in the Leguminosae Plants, Cassia fistula L. and C. javanica L.

Proanthocyanidins containing flavan-3-ol (epiafzelechin and epicatechin) units with an abnormal 2S-configuration have been isolated from the pods of Cassia fistula L. and the bark of C. javanica L. (Leguminosae), together with common flavan-3-ols and proanthocyanidins. The structures of these compounds have been established on the basis of chemical and spectroscopic evidence