All are examples of glycosaminoglycans, EXCEPT:
Glycosaminoglycans (mucopolysaccharides) are complex carbohydrates containing amino sugars and uronic acids. They may be attached to a protein molecule to form a proteoglycan. Proteoglycans provide the ground or packing substance of connective tissue. They hold large quantities of water and occupy space, thus cushioning or lubricating other structures, because of the large number of --OH groups and negative charges on the molecule which, by repulsion, keep the carbohydrate chains apa. Examples are hyaluronic acid, chondroitin sulfate, and heparin Ref: Harper 28th edition, chapter 14.
Hyaluronic acid
Chondroitin sulfate
Heparin
None of the above