a beta-D-galactosyl-(1->4)-beta-D-glucosyl-(1<->1)-ceramide + D-galactose => a globoside Gb3Cer + H2O
a beta-d-galactosyl-(1->4)-beta-d-glucosyl-(1<->1)-ceramide + d-galactose => a globoside gb3cer + h2o