on the basis of proton nmr spectroscopic data and isolation of n-acetylglucosamine 4-phosphate from acid hydrolysates , the poly ( glcnac-1-p ) was shown to be a polymer in which n-acetylglucosamine 1-phosphate units are joined at c-4 of the glucosamine residues .
C0001056
acetylglucosamine
C0017718
glucosamine