Chemical. CAS: 929903-87-7 (free base). Formula: C30H46N10O6 . C2HF3O2. MW: 642.8 . 114.0. Fluorogenic tri-peptide substrate for measuring the trypsin-like peptidase activity of the 20S proteasome. It is cleaved exclusively at the amide R-AMC bond to release fluorescent product. Shows low Km and high specific activity. Excitation: 380nm. Emission: 460nm. This substrate is useful for inhibitor screening and kinetic analysis. - Fluorogenic tri-peptide substrate for measuring the trypsin-like peptidase activity of the 20S proteasome. It is cleaved exclusively at the amide R-AMC bond to release fluorescent product. Shows low Km and high specific activity. Excitation: 380nm. Emission: 460nm. This substrate is useful for inhibitor screening and kinetic analysis.