A nonfluorescent reagent for the detection of primary amines, peptides and proteins. The reaction products are highly fluorescent.

A group of compounds consisting in part of two rings sharing one atom (usually a carbon) in common.

2,2-Dihydroxy-1H-indene-1,3-(2H)-dione. Reagent toxic to skin and mucus membranes. It is used in chemical assay for peptide bonds, i.e., protein determinations and has radiosensitizing properties.