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CN2913
29 Organic Chemicals
2913 (01/1988-..) Halogenated, Sulphonated, Nitrated or Nitrosated Derivatives of Cyclic Polymers of Aldehydes or Paraformaldehyde
29130000 (01/1988-..) Halogenated, Sulphonated, Nitrated or Nitrosated Derivatives of Cyclic Polymers of Aldehydes or Paraformaldehyde