Dithiothreitol (DTT)
Dithiothreitol is a 1,4-dithiol compound (HOCH2(CHOH)2CH2SH)2 with two SH groups directly attached to carbon atoms. HTS 2930.90.92 covers this as other organo-sulfur compound used as reducing agent in biotech. Meets chapter definition for separate chemically defined compounds.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as sugar alcohol derivative
Polyhydric alcohol structure might suggest heading 2934 for nucleic acid derivatives.
If when put up in laboratory reagent kits
Diagnostic or lab preparations classified in 3822 regardless of chemical identity.
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Import Tips & Compliance
• Specify biotech/pharma end-use on entry documents to justify Chapter 29 classification
• Maintain cold chain documentation if shipped refrigerated per stability requirements
• Avoid bulk packaging that suggests industrial chemical use triggering different scrutiny
Related Products under HTS 2930.90.92
Thiophenol
Thiophenol is a chemically defined organo-sulfur compound consisting of a benzene ring with a directly attached thiol group (-SH). It falls under HTS 2930.90.92 as an organo-sulfur compound other than those specified in earlier subheadings of heading 2930. This classification applies to pure thiols where sulfur is directly linked to carbon, distinguishing it from sulfonated or halogenated derivatives.
1-Butanethiol
1-Butanethiol (n-butyl mercaptan) is an acyclic aliphatic thiol with formula CH3(CH2)3SH, a separate chemically defined organo-sulfur compound. Classified in 2930.90.92 as other organo-sulfur compounds where sulfur is directly linked to carbon atom. Used in odorant applications and organic synthesis.
Ethyl 2-Mercaptoacetate
Ethyl 2-mercaptoacetate (HS-CH2COOCH2CH3) is an organo-sulfur ester with thiol group directly attached to carbon. Falls under HTS 2930.90.92 as other organo-sulfur compounds per chapter hierarchy. Used as intermediate in pharmaceutical synthesis.
2-Mercaptoethanol
2-Mercaptoethanol (HS-CH2CH2OH) contains both thiol (-SH) and alcohol (-OH) groups with sulfur directly linked to carbon. Classified in 2930.90.92 as other organo-sulfur compound taking precedence in numerical order. Common biochemical reagent for protein denaturation.
Lipoic Acid
Alpha-lipoic acid contains a five-membered dithiolane ring with sulfur atoms directly linked to carbon. Classified under 2930.90.92 as other organo-sulfur compound used as nutritional supplement and antioxidant. Qualifies per Chapter 29 notes for heterocyclic sulfur compounds.
Benzyl Mercaptan
Benzyl mercaptan (C6H5CH2SH) features a thiol group attached to benzyl carbon, making it an aromatic organo-sulfur compound. Falls in HTS 2930.90.92 as other beyond specific subheadings. Used in flavor/fragrance synthesis.