Solution

Chondroitin contains repeating unit of alternating sugars N-acetylgalactosamine and glucuronic acid. It mostly attaches to proteins as part of a proteoglycan. A chondroitin chain can have over 100 individual sugars, each of which can be sulfated in variable positions and quantities. Chondroitin sulfate is an important structural component of cartilage and provides much of its resistance to compression.