SUC-ALA-ALA-PRO-LEU-PNA

N-SUCCINYL-ALA-ALA-PRO-LEU P-NITROANILIDE

N-succinyl-alanine-alanine-proline-leucine-p-nitroanilide

L-Leucinamide, N-(3-carboxy-1-oxopropyl)-L-alanyl-L-alanyl-L-prolyl-N-(4-nitrophenyl)-