It is a dark-colored resin-like substance made of water-insoluble, alcohol-soluble polymers.Dihydroquercetin dimers by oxidative coupling reactions. Gonzalez-Laredo, Ruben F., Malan, Johannes C.S., Chen, Jie, Todd, Jim, Karchesy, Joseph J. 2nd International Electronic Conference on Synthetic Organic Chemistry (ECSOC-2), September 1–30, 1998
