CAS 98640-71-2 appears in our catalog under these names: Pz–Pro–Leu–OH, Pz-Pro-Leu-OH, Collagenase-Chromophore-Substrate Test Substance, 95.00%, COLLAGENASE CHROMOPHORE SUBSTRATE TEST &. Offered by: GLPBio, Biosynth, Chemat, Sigma-Aldrich. Available pack sizes: 1g, 5g, 1000mg, 2000mg, 2500mg, 500mg, 50mg, 5000mg.