26305-03-3 Heptanoic acid, N-(3-methyl-1-oxobutyl)-L-valyl-L-valyl-4-amino-3-hydroxy-6-methylheptanoyl-L-alanyl-4-amino-3-hydroxy-6-methyl- N-(3-methyl-1-oxobutyl)-L-valyl-L-valyl-4-amino-3-hydroxy-6-methylheptanoyl-L-alanyl-4-amino-3-hydroxy-6-methylheptanoic acid NSC272671 PEPSTATIN Pepstatin A