103237-51-0 Acetylphenylalanyl-cysteinyl-tyrosyl-tryptophyl-lysyl-valyl-cysteinyl-threoninamide L-Threoninamide, N-acetyl-D-phenylalanyl-L-cysteinyl-L-tyrosyl-D-tryptophyl-L-lysyl-L-valyl-L-cysteinyl-, cyclic (2-7)-disulfide RC 161 RC-161