Preparation and biological activity of the metabolites of the potent antihyperglycemic and antihyperlipidemic agent,(E)-4-{4-[(5-methyl-2-phenyl-1, 3-oxazol-4-yl) methoxy] benzyloxyimino}-4-phenylbutyric acid (TAK-559)(1), were investigated. Metabolites MI (2), M- II (3), M-III (4) and M-IV (5) were synthesized and their biological activities were evaluated by in vitro and in vivo experiments. Compounds 2—4 activate human peroxisome proliferator ...