A high throughput screening approach to the identification of selective cholecystokinin-2 receptor (CCK-2R) ligands resulted in the discovery of a novel series of antagonists, represented by 1-[2-[(2, 1, 3-benzothiadiazol-4-ylsulfonyl) amino]-5-chlorobenzoyl]- piperidine (1; CCK-2R, p KI= 6.4). Preliminary exploration of the structure-activity relationships around the anthranilic ring and the amide and sulfonamide moieties led to a ...