Abstract
One new trimeric proanthocyanidin, epicatechin-(2β→O→7, 4β→6)-epicatechin-(2β→O→7, 4β→8)-epicatechin (5) and two new tetrameric proanthocyanidins, epicatechin-(2β→O→7, 4β→8)-[epicatechin-(4β→6)]-epicatechin-(4β→8)-epicatechin, named as parameritannin A-1 (6), and epicatechin-(2β→O→5, 4β→6)-[epicatechin-(2β→O→7, 4β→8)]-epicatechin-(4β→8)-epicatechin, named as parameritannin A-2 (7), have been isolated from the bark of Parameria laevigata Moldenke (Apocynaceae) along with the two known dimers, proanthocyanidin A-2 (1) and proanthocyanidin A-6 (2), and two trimers, cinnamtannin B-1 (3) and aesculitannin B (4). These structures were elucidated by spectral and chemical evidence.
