3-O-{beta-D-Xyl-(1->3)-[beta-D-Gal-(1->2)]-beta-D-GlcA}-quillaic acid {beta-D-Xyl-(1->3)-beta-D-Xyl-(1->4)-alpha-L-Rha-(1->2)-[beta-D-Qui-(1->4)]-beta-D-Fuc} ester + acetyl-CoA = saponarioside B + CoA — reaction