83437-31-4 DN 1417 isobutylamide DN-isobutylamide L-Prolinamide, N-(2-hydroxy-5-((2-methylpropyl)amino)-1,5-dioxopentyl)-L-histidyl- N-(2-Hydroxy-4-(isobutylcarbamoyl)butyryl)-his-pro-NH2 N-(2-Hydroxy-4-(isobutylcarbamoyl)butyryl)histidylprolinamide