*3.1. Presence of Stilbenes in the Extract*

The main compounds were ε-viniferin (16.34%, *w*/*w*), *trans*-resveratrol (8.07%, *w*/*w*), isohopeaphenol (4.11%, *w*/*w*), ampelopsin A (3.21%, *w*/*w*), pallidol (3.12%, *w*/*w*), ω-viniferin (2.77 %, *w*/*w*), miyabenol C (2.75%, *w*/*w*), r2-viniferin (2.24%, *w*/*w*), hopeaphenol (2.01%, *w*/*w*), and piceatannol (0.76%, *w*/*w*). The stilbene-enriched extract contained 45.38% (*w*/*w*) of total stilbenes.
