6-ammonio-N-{[(2R,3R)-3-{[N-(tert-butoxycarbonyl)-L-phenylalanyl-3-(1H-imidazol-3-ium-4-yl)-L-alanyl]amino}-4-cyclohexyl-2-hydroxybutyl](2-methylpropyl)carbamoyl}-L-norleucyl-L-phenylalanine

P11838 — Endothiapepsin