| 摘要 |
A compound of the formula (I): wherein R<1 >is hydrogen or lower alkyl; R<2 >is lower alkyl, etc.; R<3 >is lower alkoxy, etc.; R<4 >is hydroxy, etc.; X is O, S, etc.; Y is CH or N; Z is lower alkylene or lower alkenylene; and m is 0 or 1; or salts thereof, which are useful as a medicament.
|
