[(2->8)-N,O(9)-diacetyl-alpha-D-neuraminosyl]n polyanion
[(2->8)-n,o(9)-diacetyl-alpha-d-neuraminosyl]n polyanion
A polyanionic polymer obtained by deprotonation of the carboxy groups of [(2→8)-<em>N</em>,<em>O</em><small><sup>9</small></sup>-diacetyl-α-<small>D</small>-neuraminosyl]<small><sub><em>n</em></sub></small>; major species at pH 7.3.