Teresa, Yolanda,
Julian and Celestino (1992) have reported 17 chemical
constituents in V. vinifera (Tintal del pais) grape seeds.
The major compounds are (+)-catechin (11%), epicatechin-(4b38)-epicatechin (dimer B2) (6%), (À)-epicatechin (10%), epicatechin 3-O-gallate-(4b38)-catechin
(B1-3-O-gallate) (7%) and (À)-Epicatechin-3-O-gallate
(9%).