Glycine 7-amido-4-methylcoumarin hydrobromide is a fluorescent probe used for the detection of microorganisms. The presence of glycine 7-amido-4-methylcoumarin hydrobromide in a sample indicates the presence of microorganisms and its intensity correlates with the concentration of organisms. Glycine 7-amido-4-methylcoumarin hydrobromide is used in conjunction with automated instruments that can detect and measure the fluorescence emitted by this probe.