| abstract |
Heterobicyclic derivatives of the formula: n n n wherein n R 1 is aryl which may have suitable substituent(s), ar(lower)alkyl which may have suitable substituent(s), halo(lower)alkyl, protected carboxy(lower)alkyl, acyl(lower)alkyl, heterocyclic group or heterocyclic(lower)alkyl which may have suitable substituent(s), n R 2 is aryl which may have suitable substituent(s) or heterocyclic group, and n R 3 is hydrogen, lower alkoxy or arylthio, n and a pharmaceutically acceptable salt thereof which are useful as a medicament. |