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| OB-1 ACID |
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| 4B-acid(dye intermediate) |
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| 4.4-Diphenylethylene-Bicardoxylic Acid 98% |
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| USED AS MATERIAL FOR MAKING OUT OPTICAL BRIGHTENING AGENTS. |
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| Stable light yellow crystallized powder with the meltingpoint of 460 , which is soluble in diluted alkali solution,but insoluble in water and majoring of organic solvents |
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