H-Phe (4-Cl) -D-Cys-β- (3-pyridyl) -Ala-D-Trp-N-Me-Lys-Thr-Cys-2-Nal-NH2

PRL 3195 is a somatostatin receptor antagonist with Kis of 6, 17, 66, 1000 and 1000 nM for human somatostatin receptors (sst5, sst2, sst3, sst1 and sst4, respectively) .