Starch, galactose and glycogen are all compounds composed of carbon, hydrogen and oxygen.

Starch is polymerized from glucose molecules, which is the most common storage form of carbohydrates in cells. Starch is also called starch in catering industry, and the general formula is (C6H11O5) n;

Galactose (C6H12O6 (CHOH) 4Cho) is a molecular formula of monosaccharide, which can be found in dairy products or beets.

glycogen)(C24H42O21) is an animal starch, also known as liver sugar or glycogen, which is a branched polysaccharide combined with glucose, and its glycoside chain is α-type.