127926-22-1 20987-59-1 Boc-cck7 Cholecystokinin (27-33), t-butyloxycarbonyl- L-Phenylalaninamide, N-((1,1-dimethylethoxy)carbonyl)-O-sulfo-L-tyrosyl-L-methionylglycyl-L-tryptophyl-L-methionyl-L-alpha-aspartyl-