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2,7-Dichlorofluoresceine, is an organic dye of the fluorescein family, being substituted at the 2 and 7 positions by chloride.
D 1537 (OTTO) 2,7-Dichlorofluoresceine Cas 76-54-0 - used as an indicator for argentometry by Fajans method. It is also involved in the cellular antioxidant activity assay.