title: Benzidine substitute visualizing agents for iron porphyrins.
mesh_terms: D001560:Benzidines; D002845:Chromatography; D007202:Indicators and Reagents; D007501:Iron; D008665:Metalloporphyrins / Q000032:analysis*; D008722:Methods
chemical_list: D001560:Benzidines; D007202:Indicators and Reagents; D008665:Metalloporphyrins; D007501:Iron