81485-13-4 Heptanamide, 6-methyl-N-(1-methyl-2-((3-methylbutyl)amino)-2-oxoethyl)-4-((3-methyl-2-((3-methyl-1-oxobutyl)amino)-1-oxobutyl)amino)-3-oxo-, (4S-(N(R*),4R*(R*)))- Isovaleryl-valyl-3-oxo-4-amino-6-methylheptanoyl-alanyl-isoamylamide Pepstatin ketone analog