Z-FR-R110 (Rhodamine 110, bis-(N-CBZ-L-phenylalanyl-L-arginine amide), dihydrochloride) is a substrate for the cysteine proteases cathepsins B and L. The substrate has been used in flow cytometry studies of human monocytes and rat macrophages. λ Ex/λ Em of end product (R110) = 496/520 nm Off-white to pink solid soluble in DMSO Store at 4°C and protect from light C66H72Cl2N12O11 MW: 1278.26