118688-24-7 Caerulein, 1-(3-iodo-L-tyrosine)-2-glycine-5-L-norleucine-8-L-norleucine- Cck (26-33), I-tyr-gly-nle(28,31)- Cck-itgn Cholecystokinin (26-33), I-tyr-gly-nle(28,31)- Cholecystokinin (26-33), iodo-tyrosyl-glycyl-norleucine(28,31)- Iodo-tyr-gly-28,31-nle-cholecystokinin (26-33)