three different types of chondroitin polysulfate-peptide , chondroitin sulfate d-peptide , chondroitin sulfate e-peptide , and chondroitin sulfate k-peptide , all contained xylose , galactose , and serine in a molar ratio of about 1 : 2 : 1 .
C0008454
chondroitin
C0008466
chondroitin sulfate