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From Biology-Online Dictionary
(Science: chemical) 4,4'-(3-(2-pyridinyl)-1,2,4-triazine-5,6-diyl)bisbenzenesulfonic acid, disodium salt. A ferroin compound that forms a stable magenta-coloured solution with the ferrous ion. The complex has an absorption peak at 562 nm and is used as a reagent and indicator for iron.
Pharmacological action: indicators and reagents, iron chelating agents.
chemical name: Benzenesulfonic acid, 4,4'-(3-(2-pyridinyl)-1,2,4-triazine-5,6-diyl)bis-, disodium salt