In an ongoing project directed toward the discovery of novel treatments for diabetic complications from traditional herbal medicines, six galloyl glucoses, 1,2,3-tri-O-galloyl-β-D-glucose (1), 1,2,6-tri-O-galloyl-β-D-glucose (2), 1,2,3,6-tetra-O-galloyl-β-D-glucose (3),