label: a beta-D-glucosylceramide + D-galactose => a beta-D-galactosyl-(1->4)-beta-D-glucosyl-(1<->1)-ceramide + H2O
label_lc: a beta-d-glucosylceramide + d-galactose => a beta-d-galactosyl-(1->4)-beta-d-glucosyl-(1<->1)-ceramide + h2o