CAS 4178-93-2 appears in our catalog under these names: L-Leucine-p-nitroanilide, L–Leucyl–4–nitroanilide, H-L-Leu-pNA, L-Leucine-4-nitroanilide, 99% , L-Leucine 4-nitroanilide. Offered by: TargetMol, GLPBio, Iris Biotech, Thermo Scientific (Alfa Aesar), Biosynth. Available pack sizes: 1g, 500mg, 5g, 25g, 100g, 10g, 0,1g, 50g.