4, 4′-Diamino-2, 2′-stilbenedisulfonic acid is the organic compound with the formula (H2NC6H3SO3H) 2C2H2. It is a white water-soluble solid. Structurally, it is a derivative of trans-stilbene, containing amino and sulfonic acid functional groups on each of the two phenyl rings.
The compound is a popular optical brightener for use in laundry detergents. It is produced by reduction of 4, 4′-dinitro-2, 2′-stilbenedisulfonic acid with iron powder.
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