a ganglioside Ac-O-9-GT3 + UDP-N-acetyl-alpha-D-galactosamine <=> a ganglioside Ac-O-9-GT2 + UDP + H(+)
a ganglioside ac-o-9-gt3 + udp-n-acetyl-alpha-d-galactosamine <=> a ganglioside ac-o-9-gt2 + udp + h(+)