1H-Benz[f]isoindole-1,3(2H)-dione, 2-(2-hydroxyethyl)-

2-(2-Hydroxyethyl)-1H-benz[f]isoindole-1,3(2H)-dione is used as a reagent to synthesize 1,1,1-Trifluoromethanesulfonic Acid 2-(1,3-Dihydro-1,3-dioxo-2H-benz[f]isoindol-2-yl)ethyl Ester (T791470), a compound that is used as a reactive ultraviolet and fluorescent labeling agent for determining the presence of carboxylic acids by high performance liquid chromatography and also as a derivatization agent.