CYN154806

CC (O) C1NC (=O) C (CCCCN) NC (=O) C (CC2=C[NH]C3=CC=CC=C23) NC (=O) C (CC4=CC=C (O) C=C4) NC (=O) C (CSSCC (NC1=O) C (=O) NC (CC5=CC=C (O) C=C5) C (N) =O) NC (=O) C (CC6=CC=C (C=C6) [N; v5] (=O) =O) NC (C) =O

CYN154806, a cyclic octapeptide, is a potent and selective somatostatin SST2 receptor antagonist, with pIC50 values of 8.58, 5.41, 6.07, 5.76 and 6.48 for human recombinant SST2, SST1, SST3, SST4 and SST5 receptors respectively.