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4-Methyl-7-(4-nitrophenoxy)-2H-chromen-2-one is a fluorescent coumarin derivative.^1,2 It displays excitation/emission maxima of 323/445 nm, respectively.¹ Unlike the hydrogen sulfide probe 7-(2,4-dinitrophenoxy)-4-methyl-2H-chromen-2-one , 4-methyl-7-(4-nitrophenoxy)-2H-chromen-2-one does not undergo an increase in fluoresence intensity in the presence of sulfur-containing molecules.^1,2

1. Zhang, B., Ge, C., Yao, J., et al. Selective selenol fluorescent probes: Design, synthesis, structural determinants, and biological applications J. Am. Chem. Soc. 137(2),757-769(2015).
2. Chen, Y., Shang, X., Li, C., et al. The synthesis, crystal, hydrogen sulfide detection and cell assement of novel chemsensors based on coumarin derivatives Sci. Rep. 8(1),16159(2018).