Disclosed is a compound which is useful as an AMPK activator. A compound represented by the formula: its pharmaceutically acceptable salt, or a solvate thereof, wherein a group represented by the formula: is a group represented by the formula: R 1 is each independently halogen, hydroxy, cyano, nitro, carboxy, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl or the like； m is an integer of 0 to 3； R 2 is hydrogen, or substituted or unsubstituted alkyl； X is -O-； and Y is substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl.
