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Harmonized System
Section VI > Chapter 28 > Heading 2829
Chlorates and perchlorates; bromates and perbromates; iodates and periodates.
Section VI > Chapter 28 > Heading 2830
Sulphides; polysulphides, whether or not chemically defined.
Section VI > Chapter 28 > Heading 2830 > 2830.10
Sodium sulphides
Section VI > Chapter 28 > Heading 2831
Dithionites and sulphoxylates.