7-Hydroxy-4-methylcoumarin-3-acetic acid

7-Hydroxy-4-methylcoumarin-3-acetic acid is a blue-emitting, environmentally sensitive fluorescent probe whose emission is pH-dependent. It is extensively utilized for labeling biomolecules like peptides and carbohydrates in biochemical research, facilitating both in vitro assays and in vivo imaging studies due to its responsive photophysical properties.