2,2-Dihydroxy-1,3-indandione; 1H-Indene-1,2,3-trione 2-Hydrate; 2,2-Dihydroxy-1,3-dioxoindan; 2,2-Dihydroxy-1,3-indandione; 2,2-Dihydroxy-1H-indene-1,3(2H)-dione; 2,2-Dihydroxy-indene-1,3-dione; 2,2-Dihydroxyindane-1,3-dione; 2,3-Dihydro-2,2-dihydroxy-1,3-dioxo-1H-indene; Indane-1,2,3-trione monohydrate; Triketohydrindene Hydrate

Ninhydrin is used for the detection of free amino groups in amino acids, peptides and proteins.