the enzyme was inactive towards most hexosamines ( galactosamine , mannosamine , n-acetylglucosamine , n-acetylgalactosamine , and n-acetylmannosamine , but not glucosamine ) , meso-inositol , d-fructose , and tetrasaccharides from hyaluronic acid and chondroitin 4-sulfate .
C0001056
n-acetylglucosamine
C0017718
glucosamine