A COMPOUND REPRESENTED BY THE GENERAL FORMULA (II) BELOW OR A SALT THEREOF IS USED AS AN ACTIVATING AGENT FOR PPAR δ. WHEREIN Ga IS O, CH2 OR THE LIKE Aa IS THIAZOLE, OXAZOLE, OR THIOPHENE, WHICH CAN HAVE A SUBSTITUENT SUCH AS A SUBSTITUENT SUCH AS C1-8 ALKYL, C1-8 ALKOXY, HALOGEN, C2-8 ALKYL SUBSTITUTED WITH HALOGEN OR THE LIKE Ba IS A C1-8 ALKYLENE OR C2-8 ALKENYLENE CHAIN AND EACH OF R1a AND R2a INDEPENDENTLY IS HYDROGEN, C1-8 ALKYL, C1-8 ALKOXY, HALOGEN, C1-8 ALKYL SUBSTITUTED WITH HALOGEN OR THE LIKE.