4,4'-Diaminostilbene-2,2'-disulfonic Acid
https://www.porphyrin.net/shop/fm-3b-d0121-44-diaminostilbene-22-disulfonic-acid-83719
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4,4'-Diaminostilbene-2,2'-disulfonic Acid 25g : Brightening agent and intermediate for dyes, optical brighteners, and specialty polymer additives.
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