Provided is a medicinal composition for removing drusen and/or inhibiting the formation thereof, and/or treating and/or preventing age-related macular degeneration, said composition comprising a compound of formula (I) [wherein: Ra(s) are independently selected from a group consisting of halo, hydroxy, alkyl, halo-substituted alkyl, aryl, halo- or alkyl-substituted aryl, alkoxy, hydroxy- or carboxy-substituted alkoxy, aryloxy, halo- or alkyl-substituted aryloxy, CHO, C(O)-alkyl, C(O)-aryl, C(O)-alky-carboxyl, C(O)-alkylene-carboxy ester and cyano and m is an integer of 0 to 4].
