(28,31-N-Acetyl-nle)-cholecystokinin (26-33) 103494-23-1 105504-60-7 Cck (26-33), N-Ac-nle(28,31)- Cholecystokinin (26-33), N-acetyl-nle(28,31)- Cholecystokinin (26-33), N-acetyl-norleucine(28,31)- L-Phenylalaninamide, N-acetyl-L-alpha-aspartyl-O-sulfo-L-tyrosyl-L-norleucylglycyl-L-tryptophyl-L-norleucyl-L-alpha-aspartyl-, monosodium salt