Organo-Sulfur Compounds, Not Elsewhere Specified

Residual organo-sulfur compounds not captured by more specific headings — such as thiocarbamates, thiurams, or methionine — include a wide array of specialty chemicals used as antioxidants, lubricant additives, pharmaceutical intermediates, and flavor compounds. Correct classification here requires demonstrating that the substance does not fit a more specific sulfur-compound heading, which often necessitates detailed structural documentation. The chemical diversity within this NES category means that duty rates, trade-remedy exposure, and end-use regulations can vary considerably from one compound to the next.

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