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

This compound is a selective and sensitive fluorescent probe for hydrogen sulfide (H2S) detection, featuring low cytotoxicity and a turn-on emission shift to ~392 nm upon HS- addition. It is suitable for in vitro and cellular imaging studies, enabling research into H2S biology and related signaling pathways.