quercetin 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside + (E)-caffeoyl-CoA <=> quercetin 3-O-[(6-O-[(E)-caffeoyl]-beta-D-glucosyl)-(1->2)-beta-D-glucoside] + CoA + H(+)
quercetin 3-o-beta-d-glucosyl-(1->2)-beta-d-glucoside + (e)-caffeoyl-coa <=> quercetin 3-o-[(6-o-[(e)-caffeoyl]-beta-d-glucosyl)-(1->2)-beta-d-glucoside] + coa + h(+)