a globoside Gb4Cer + UDP-N-acetyl-alpha-D-galactosamine => a globoside IV3GalNAc-Gb4Cer + UDP + H(+)
a globoside gb4cer + udp-n-acetyl-alpha-d-galactosamine => a globoside iv3galnac-gb4cer + udp + h(+)