[Constituents of the seed coat of Arachis hypogaea L].

From the seed coat of Arachis hypogaea two compounds were isolated. They were identified as the dimer of proanthocyanidin-A type(I) and D-(+)-catechin (II) on the basis of UV, IR, MS, CD, 1H-NMR, 13C-NMR and chemical evidences. It has been found that II is the effective constituent of this plant and I has some active effects as well.