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Catsyn? Cyclobuta[1,2-C:3,4-C']difuran-1,3,4,6-tetrone, tetrahydro-3A,6A-dimethyl- | CAS 137820-87-2?? ?? ??? ?????. ? ??? C10H8O6??, ???? 224.17g/mol??, ??? ????? 99%???.