label: [(2->6)-alpha-D-glucosyl-(1->4)-N-acetyl-alpha-D-neuraminosyl](n) + n acetyl-CoA => [(2->6)-alpha-D-glucosyl-(1->4)-N,7-O-diacetyl-alpha-D-neuraminosyl](n) + n CoA
label_lc: [(2->6)-alpha-d-glucosyl-(1->4)-n-acetyl-alpha-d-neuraminosyl](n) + n acetyl-coa => [(2->6)-alpha-d-glucosyl-(1->4)-n,7-o-diacetyl-alpha-d-neuraminosyl](n) + n coa