| 摘要 |
The present invention relates to oxygen-containing heterocyclic compounds represented by the following formula (I):wherein m represents an integer of 0 to 4; R1, R2, R3 and R4 independently represent a hydrogen atom, substituted or unsubstituted lower alkyl, etc.; R5 represents substituted or unsubstituted lower alkoxy etc.; R6 represents a hydrogen atom etc.; and Y represents the following formula (II):wherein R9 represents cyano etc., R10 represents a hydrogen atom etc., R11 represents carboxy etc., and R12 represents a hydrogen atom etc.; and the like; orpharmaceutically acceptable salts thereof.
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