| abstract |
The present invention relates to oxygen-containing heterocyclic compounds represented by the following formula (I): (see formula) wherein m represents an integer from 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): (see formula) wherein R9 represents cyano etcetera, R10 represents an atom of hydrogen Etcetera, R11 represents carboxy etcetera, and R12 represents an atom of hydrogen etcetera; and the like; or pharmaceutically acceptable salts thereof. |