bacterial chondroitinase abc converted more than 98 % of the 35so4-labeled polymer to mono- or disaccharides , including ( 1 ) n-acetyl-d-galactosamine 4-sulfate , ( 2 ) delta 4,5-glucuronic acid 2- or 3-sulfate leads to n-acetylgalactosamine 6-sulfate , and ( 3 ) the unsaturated disaccharides normally obtained from chondroitin 4-sulfate and chondroitin 6-sulfate sequences .
C0016943
galactosamine
C0001055
acetylgalactosamine