OXYGEN-CONTAINING HETEROCYCLIC COMPOUNDS

摘要

The present invention relates to oxygen-containing heterocyclic compounds represented by the following formula (I): <CHEM> wherein m indicates an integer of 0 to 4; R<1>, R<2>, R<3> and R<4> are the same or different, and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted cycloalkyl, etc.; R<5> represents hydroxy or substituted or unsubstituted lower alkoxy; R<6> represents a hydrogen atom or halogen; and Y represents the following formula (i) or formula (ii): <CHEM> or <CHEM> or pharmaceutically acceptable salts thereof.i