5920-14-9 Boc-cck (31-33)-NH2 Butyloxycarbonyl-cholecystokinin (31-33) amide Cholecystokinin (31-33) amide, butyloxycarbonyl- Cholecystokinin (31-33)-NH2, butyloxycarbonyl- L-Phenylalaninamide, N-((1,1-dimethylethoxy)carbonyl)-L-methionyl-L-aspartyl-