The design and synthesis of a new type of 5-HT3 ligand with subnanomolar affinity are described. The O-dialkylaminoethyloximinothienopyrrolizine structure was deduced from molecular modeling studies by replacement of an amidine moiety by an oximino one.
The present invention relates to compounds of formula (I): ##STR1## wherein A, x, y, R.sub.1, R.sub.2 and R.sub.3 are as defined in the description. The compounds are useful for treating diseases requiring a selective serotonin reuptake site and 5-HT.sub.2c or 5-HT.sub.3 ligand.