[4)-D-GlcpNS-(1->](1-) residue
[4)-d-glcpns-(1->](1-) residue
An organic anionic group resulting from the removal of the proton from the sulfamic acid group of [4)-<small>D</small>-GlcpN<em>S</em>-(1→] residue. The major structure at pH 7.3 of <em>N</em>-sulfo-<small>D</small>-glucosamine residue.