TRICYCLIC BENZODIAZEPINE DERIVATES THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM

摘要

Tricyclic compounds of the formula (I) wherein R1 is hydrogen or an organic group, R2 is aryl which may have suitable substituent(s), R3 is hydrogen or an acyl group and A is lower alkylene, and pharmaceutically acceptable salts thereof which are useful as a medicament.