[N-acetyl-alpha-D-neuraminosyl-(2->8)](n) + n acetyl-CoA => [N,O(9)-diacetyl-alpha-D-neuraminosyl-(2->8)](n) + n CoA
[n-acetyl-alpha-d-neuraminosyl-(2->8)](n) + n acetyl-coa => [n,o(9)-diacetyl-alpha-d-neuraminosyl-(2->8)](n) + n coa