Mercaptocarboxylic acids
Organo-sulfur compounds: > Other: > Other: > Other: > Acids: > Other > Mercaptocarboxylic acids
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 2930.90.49.20
Thioglycolic Acid
Thioglycolic acid (mercaptoacetic acid), HSCH2COOH, is a chemically defined organic compound containing a mercapto (-SH) group directly linked to a carbon atom and a carboxylic acid function. It falls under HTS 2930.90.4920 as a mercaptocarboxylic acid within the organo-sulfur compounds of Chapter 29. Commonly used in hair perming solutions, metal extraction, and polymer synthesis.
2-Mercaptopropionic Acid
2-Mercaptopropionic acid (HS-CH2-CH2-COOH) is an organo-sulfur carboxylic acid with both mercapto and carboxyl groups on adjacent carbons. Classified under HTS 2930.90.4920 as 'other mercaptocarboxylic acids' per Chapter 29 notes defining organo-sulfur compounds. Used in pharmaceutical intermediates and chelating agents.
3-Mercaptopropanoic Acid
3-Mercaptopropanoic acid features a three-carbon chain with terminal mercapto and carboxylic acid groups. This separate chemically defined compound qualifies under HTS 2930.90.4920 as a mercaptocarboxylic acid per Chapter 29 scope. Applied in polymer cross-linking and biochemical research.
Mercaptosuccinic Acid
Mercaptosuccinic acid (thiomalic acid) contains both mercapto and dicarboxylic acid functions in a single molecule. Falls under HTS 2930.90.4920 as 'other mercaptocarboxylic acids' since organo-sulfur takes precedence over oxygen functions per Chapter 29 classification rules. Used in heavy metal detoxification.
2-Mercaptobenzoic Acid
2-Mercaptobenzoic acid (thiosalicylic acid) combines aromatic carboxylic acid with ortho-mercapto group. Classified in HTS 2930.90.4920 as aromatic mercaptocarboxylic acid under organo-sulfur compounds. Key intermediate for thioindigo dyes and pharmaceuticals.
4-Mercaptobenzoic Acid
4-Mercaptobenzoic acid features para-substituted mercapto and carboxylic groups on benzene ring. HTS 2930.90.4920 classification as aromatic mercaptocarboxylic acid per Chapter 29 organo-sulfur provisions. Utilized in nanotechnology and self-assembled monolayers.
Captopril
Captopril, (2S)-1-[(2S)-3-mercapto-2-methylpropionyl]-L-proline, contains a mercaptocarboxylic acid side chain. Despite complex structure, classified under HTS 2930.90.4920 as its mercapto acid functionality defines the organo-sulfur nature per Chapter 29. Pharmaceutical API for hypertension treatment.
Penicillamine
D-Penicillamine, 3-mercapto-D-valine, is a mercaptocarboxylic amino acid used in Wilson's disease treatment. The free mercapto and carboxylic functions qualify it for HTS 2930.90.4920 classification as organo-sulfur compound. Chapter 29 takes precedence over amino acid headings.
Thiolactic Acid
Thiolactic acid (2-mercaptopropanoic acid) contains alpha-mercapto functionality on lactic acid backbone. Pure compound status under Chapter 29(a) places it in HTS 2930.90.4920 as mercaptocarboxylic acid. Used in depilatory creams and flavor synthesis.
Mercaptoacetic Acid Sodium Salt
Sodium thioglycolate, the sodium salt of thioglycolic acid, maintains classification with parent mercaptocarboxylic acid. Per Chapter 29 note 3(C)(1), inorganic salts follow organic acid heading HTS 2930.90.4920. Common in hair waving solutions.