label: a D-glucoside + [(1->2)-beta-D-glucosyl](n) = a beta-D-glucosyl-(1->2)-D-glucoside + [(1->2)-beta-D-glucosyl](n-1)
label_lc: a d-glucoside + [(1->2)-beta-d-glucosyl](n) = a beta-d-glucosyl-(1->2)-d-glucoside + [(1->2)-beta-d-glucosyl](n-1)