Oxygenic heterocyclic compounds represented by formula (I) or pharmacologically acceptable salts thereof: wherein m is an integer of 0 to 4; R?1, R2, R3, and R4¿ are the same or different and each represents hydrogen, optionally substituted lower alkyl, etc.; R5 represents optionally substituted lower alkoxy, etc.; R6 represents hydrogen, etc.; and Y represents, e.g., formula (II) (wherein R9 represents cyano, etc.; R10 represents hydrogen, etc.; R11 represents carboxy, etc.; and R12 represents hydrogen, etc.).