a ganglioside Ac-O-9-GD3 + UDP-N-acetyl-alpha-D-galactosamine = a ganglioside Ac-O-9-GD2 + UDP + H(+)
a ganglioside ac-o-9-gd3 + udp-n-acetyl-alpha-d-galactosamine = a ganglioside ac-o-9-gd2 + udp + h(+)