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Direct Black 22

5-Amino-2-(4-aminophenylamino) benzenesulfonic asid doub nitruration, nan kondisyon alkalin ak 6-Amino-4-hydroxynaphthalene-2-sulfonic asid (2 Moore) makonnen, Lè sa a, doub nitruration, ak Benzèn-1,3-dyamine (2 Moore) makonnen.
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