3,3',5,5'-Tetramethylbenzidine
https://www.pcovery.com/shop/fm-3b-t1023-33-55-tetramethylbenzidine-83922
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3,3',5,5'-Tetramethylbenzidine 1g : Aromatic diamine for polymerization, dyes, coatings, and specialty resins.
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