10-methyl-9-(phenoxycarbonyl) Acridinium (trifluoromethylsulfonate) is an acridinium ester that produces fluorescent 10-methyl-9-acridone upon oxidation with hydrogen peroxide, persulfate, and other oxidants under alkaline conditions. 10-methyl-9-(phenoxycarbonyl) Acridinium (trifluoromethylsulfonate) can be used in chemiluminescent assays, enzyme, antigen, antibody, and hormone immunoassays, and for the detection of oxidants in environmental, biological, and pharmaceutical samples.