4-(4,5-diphenyl-1H-imidazol-2-yl)benzoyl chloride (DIB-Cl) as reagent for amine labelling was used successfully for derivatization and fluorescence detection of enantiomers of methamphetamin and p-hydroxymethamphetamin, in urine samples. It has also been used for 3,4-Methylendioxy-N-methylamphetamin in blood, morpholine and orther compounds. DIB-Cl as a label was used on fluorescent derivatization some hydroxyl group containing endocrine disruptors, including bisphenol A (BPA), bisphenol B (BPB), bisphenol E (BPE), bisphenol F (BPF) and 4-nonylphenol (4-NP). DIB-Cl showed superior fluorescence intensity (FI) to other commercially available reagents, excellent stability in solution and high reactivity with primary and secondary amines under mild conditions.