| 摘要 |
This invention provides a compound of the formula (I):
wherein the ring A is an optionally substituted carbocyclic group or an optionally substituted heterocyclic group; R 1 is optionally substituted lower alkyl, optionally substituted lower alkenyl, optionally substituted lower alkynyl; R 2a and R 2b are each independently hydrogen, optionally substituted lower alkyl or optionally substituted acyl; R 3a , R 3b , R 3c and R 3d are each independently hydrogen, halogen, hydroxy or optionally substituted lower alkyl etc.; a pharmaceutically acceptable salt or solvate thereof,
which is useful for treating diseases induced by production, secretion and/or deposition of amyloid ² protein. |
