Vicianin (mandelonitrile beta-vicianoside 6-O-alpha-L-arabinopyranosyl-beta-D-glucopyranoside) is a cyanogenic glycoside containing unusual disaccharide vicianose, composed of glucose and arabinose. Vicianin was first isolated and identified from Vicia Angustifolia seeds in 1906. It was later found in a number of fern species. Vicianin hydrolase catalyzes the hydrolysis of Vicianin into mandelonitrile and a disaccharide vicianose. The physiological and toxicological properties of this compound have not been evaluated in humans.