Ac-KQKLR-AMC (Cathepsin S substrate) is a biological active peptide. (Cathepsins are a class of globular lysosomal proteases, playing a vital role in mammalian cellular turnover. They degrade polypeptides and are distinguished by their substrate specificities. Cathepsin S is a cysteine proteinase involved in the pathogenesis of autoimmune diseases, atherosclerosis, cancer, obesity and related diseases.This peptide is a cathepsin S substrate fluorescently labeled with AMC (Ex/Em=354 nm/442 nm). It can be used to measure cathepsin S activity.)

Ethacridine lactate monohydrate is an aromatic organic compound based on acridine used as an antiseptic agent.

9-(2,2-Dicyanovinyl)julolidine (DCVJ) is a fluorogenic dye that is considered a fluorescent molecular rotor because its properties depend on the rotational relaxation of the molecule, which can be influenced by the viscosity of the solvent used.