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Catsyn? 4,4'-[(2,5-Dimethoxy-1,4-phenylene)DI-2,1-ethynediyl]bis-benzoicacid | CAS 1190438-53-9?? ?? ??? ?????. ? ??? C26H18O6??, ???? 426.42g/mol??, ??? ????? NLT 98%???.