| abstract |
Compounds of formula <IMAGE> wherein R1 is hydrogen or one or more specified substituents, X is -O- or -NR2- where R2 is lower alkyl, lower alkenyl, lower alkynyl, aryl or specified substituted lower alkyl or R2 represents a group -Z- which is connected to the 8-position of the aromatic ring so as to form a heterocyclic ring of 5 to 7 ring members, Y is O or NR3 where R3 is hydrogen or lower alkyl, and B is a saturated azabicyclic ring (e.g. tropanyl or quinuclidinyl) or a N-oxide thereof and their acid addition salts are 5-HT3 antagonists which may be used in, for example, the treatment of neuro-psychiatric disorders. |