heparin , carboxy-group-reduced heparin , several sulphated monosaccharides and disaccharides formed from heparin , and a tetrasaccharide prepared from chondroitin sulphate were treated at 100 degrees c with hydrazine containing 1 % hydrazine sulphate for periods sufficient to cause complete n-deacetylation of the n-acetylhexosamine residues .
C0020231
hydrazine
C0063067
hydrazine sulphate