4,4′-Diamino-2,2′-stilbenedisulfonic acid

4,4′-Diamino-2,2′-stilbenedisulfonic acid

Names
IUPAC name 4,4′-Diamino-2,2′-stilbenedisulfonic acid
Other names amsonic acid
Identifiers
CAS Number	81-11-8
Properties
Chemical formula	C14H14N2O6S2
Molar mass	370.40
Appearance	white solid
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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.