It forms a cyclic acid anhydride, succinic anhydride. Dehydration of succinic acid gives succinic anhydride. So succinic acid will yield succinic anhydride. This colorless solid is the acid anhydride of succinic acid. Examples are succinimide, derived from succinic acid, and phthalimide, derived from phthalic acid. These include acetic, lactic and succinic acids, and putrescine. Either the dye or the sugar is reacted with succinic anhydride. Today, mainly AKD (alkyl ketene dimer) and ASA (alkenyl succinic anhydride) are used. The pulp also contains glucose, fructose, sucrose, inositol, citric acid, and succinic acid. Other routes are from butadiene, allyl acetate and succinic acid. Doxylamine is primarily used as the succinic acid salt, doxylamine succinate. Pasteur thought that succinic acid inverted sucrose. Fumaric acid was first prepared from succinic acid. The binding of succinic dehydrogenase to the substrate, succinate, is competitively inhibited. Arsenite inhibits not only the formation of acetyl-CoA but also the enzyme succinic dehydrogenase.