Polysaccharides( *E)are complex carbohydrates Hyaluronic acid 透明质酸 Glucuronic acid 葡萄醛酸 CH,OH Chitin:甲壳素 COH O OH NHCCH CHOH O OH NHCCH, N-AcetylglucosaminePolysaccharides (多糖) are complex carbohydrates Hyaluronic acid: 透明质酸 Glucuronic acid: 葡萄醛酸 Chitin: 甲壳素