This invention is concerned with compounds of the formula wherein A, R.sup.1 to R.sup.5 are as defined in the specification and G is a pyridine, quinoline or pyrimidine group as defined in the specification, and pharmaceutically acceptable salts thereof. The invention further relates to pharmaceutical compositions containing such compounds, to a process for their preparation and to their use for the treatment and/or prevention of diseases which are associated with the modulation of SST receptors subtype 5.