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Catsyn? 5'-(4-Carboxyphenyl)-2'-methyl[1,1':3',1''-terphenyl]-4,4''-dicarboxylicacid | CAS 1774401-31-8?? ?? ??? ?????. ? ??? C28H20O6??, ???? 452.45g/mol??, ??? ????? NLT 98%???.