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Organo-sulfur compounds: > Other: > Other: > Other: > Acids: > Other > Other
Duty Rate (from China)
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 2930.90.49.50
Methanethiosulfonic Acid S-Methyl Ester
Methanethiosulfonic acid S-methyl ester is an organo-sulfur compound featuring a thioester functional group where sulfur is directly linked to carbon. Classified under HTS 2930.90.4950 as 'other' organo-sulfur acids, it falls within Chapter 29's scope for separate chemically defined organic compounds containing sulfur directly bonded to carbon. Primarily used as a reagent in organic synthesis and protein modification research.
Ethyl 2-Mercaptoacetate
Ethyl 2-mercaptoacetate (HSCH₂CO₂Et) is a mercaptoacetic acid ester classified as an organo-sulfur acid derivative under HTS 2930.90.4950. The thiol (-SH) group provides sulfur directly linked to carbon, fitting Chapter 29's definition of organo-sulfur compounds excluding sulfonated types. Used in polymer synthesis and as pharmaceutical intermediate.
2-Mercaptopropionic Acid
2-Mercaptopropionic acid (CH₃CH(SH)CH₂COOH) contains both carboxylic acid and thiol functions with sulfur directly bonded to carbon, classified under HTS 2930.90.4950 as other organo-sulfur acids. Meets Chapter 29 criteria for chemically defined compounds; the sulfur-carbon linkage distinguishes it from Chapter 28 inorganic acids. Used in chelating agents and metal extraction.
3-Mercaptopropionic Acid
3-Mercaptopropionic acid (HSCH₂CH₂COOH) is a straight-chain organo-sulfur carboxylic acid with sulfur directly linked to carbon, falling under HTS 2930.90.4950. Excluded from sulfonated derivatives per Chapter 29 note 6; qualifies as chemically defined compound. Applications include surface modification and polymer cross-linking.
Thioglycolic Acid (Mercaptoacetic Acid)
Thioglycolic acid (HSCH₂COOH), also known as mercaptoacetic acid, is the prototypical organo-sulfur carboxylic acid classified under HTS 2930.90.4950. Features direct sulfur-carbon bonding meeting heading 2930 criteria; excluded from Chapter 32 coloring matters. Widely used in hair permanents, metal polishing, and chemical synthesis.
Cysteine Hydrochloride Monohydrate
L-Cysteine hydrochloride monohydrate is the hydrochloride salt of an organo-sulfur amino acid classified under HTS 2930.90.4950 per Chapter 29 note 4(C)(1). The organic acid-function compound determines classification; sulfur directly linked to carbon. Used as dough conditioner and nutritional supplement.
Penicillamine
D-Penicillamine, a sulfhydryl-containing amino acid analog, classified under HTS 2930.90.4950 as organo-sulfur acid. Features thiol group with direct C-S bond; used primarily as chelating agent for Wilson's disease and rheumatoid arthritis treatment. Meets chemically defined compound requirements.
Mercaptosuccinic Acid
Mercaptosuccinic acid (HSCH₂CH(COOH)CH₂COOH) is a di-carboxylic acid with thiol functionality, classified under HTS 2930.90.4950. Contains sulfur directly bonded to carbon; excluded from cyclic anhydrides per note 8. Used in heavy metal chelation and polymer modification.
2-Mercaptobenzoic Acid
2-Mercaptobenzoic acid contains a thiol group ortho to carboxylic acid on benzene ring, classified under HTS 2930.90.4950 as other organo-sulfur acid. Direct C-S bonding qualifies for heading 2930; aromatic structure doesn't change classification. Used in synthesis of thiochromones and dyes.
Thiosalicylic Acid
Thiosalicylic acid (2-mercaptobenzoic acid) is an aromatic organo-sulfur compound with both thiol and carboxylic acid groups, classified under HTS 2930.90.4950. Meets all Chapter 29 criteria for chemically defined sulfur-carbon compounds. Used as rubber accelerator intermediate and analytical reagent.
Methanesulfinic Acid Sodium Salt
Sodium methanesulfinate (CH₃S(O)ONa) is the sodium salt of methanesulfinic acid, classified under HTS 2930.90.4950 per Chapter 29 note 4(C)(1). Contains sulfur directly linked to carbon via sulfinic acid function; distinguished from sulfonic acids. Used as reducing agent in organic synthesis.
Mercaptoethanesulfonic Acid Sodium Salt
Sodium 2-mercaptoethanesulfonate (mesna) contains both thiol and sulfonic acid groups but classified under HTS 2930.90.4950 based on principal organo-sulfur characteristics. Direct C-S linkages qualify; used as mucolytic and cytoprotective agent in chemotherapy.
Lipoic Acid (Alpha-Lipoic Acid)
Alpha-lipoic acid contains a five-membered disulfide ring with carboxylic acid, classified under HTS 2930.90.4950 as organo-sulfur acid. Direct C-S bonds qualify; cyclic but not excluded heterocyclic per note 8. Used as antioxidant supplement and diabetes treatment.
Dimethylthiosulfinate
Dimethylthiosulfinate ((CH₃)₂S(O)) is an organo-sulfur compound with sulfinyl group, classified under HTS 2930.90.4950. Contains S-C bonds meeting heading criteria; unstable oil used as garlic flavor intermediate and antimicrobial agent.
Mercaptopropionic Acid Thiolactic Acid
Thiolactic acid (2-mercaptopropanoic acid) is an alpha-mercapto carboxylic acid classified under HTS 2930.90.4950. Direct sulfur-carbon bonding with both thiol and carboxylic functions; used in cosmetic depilatories and metal finishing.