7-(2,4-Dinitrophenoxy)-4-methyl-2H-chromen-2-one

7-(2,4-Dinitrophenoxy)-4-methyl-2H-chromen-2-one is a turn-on fluorescent probe for the detection of hydrogen sulfide (H2S).{51047} 7-(2,4-Dinitrophenoxy)-4-methyl-2H-chromen-2-one undergoes thiolysis by hydrogen sulfide (HS1-). It displays excitation/emission maxima of 323/445 nm, respectively, in DMSO and its fluorescence intensity increases in the presence of sulfur-containing molecules.{51048,51049,51047} 7-(2,4-Dinitrophenoxy)-4-methyl-2H-chromen-2-one is selective for sulfur-containing molecules, including cysteine, glutathione (GSH), homocysteine, and selenocysteine and is not cytotoxic up to a concentration of 150 µg/ml.{51047,51048}