The amine-reactive AMCA, SE (7-amino-4-methylcoumarin-3-acetic acid, succinimidyl ester) and its conjugates yield blue-fluorescence (approximate excitation emission maxima ~353 442) that can be used as a contrasting color in multicolor applications.
7-Hydroxycoumarin-3-carboxylic acid, SE is the amine-reactive succinimidyl ester of 7-Hydroxycoumarin-3-carboxylic acid. This coumarin is also increasingly used to label peptides, nucleotides and carbohydrates.