of aryl-substituted cinnamic acid were synthesized and studied for their antihyperglycemic activity in neonatal streptozotocin-induced diabetic Wister male rats. Substitution of the aryl ring resulted in higher activity. 3-(2,4-Dimethoxyphenyl)-2-4-[4-(2,4-dioxothiazolidin-5-ylmethyl)phenoxy]-phenyl}-acrylicacid methyl ester (Thz7), was found to be most active compound in this series which showed