Naphth[1,2-d]-[1,2,3]-Oxadiazole-5-Sulfonic Acid
Naphth[1,2-d]-[1,2,3]-oxadiazole-5-sulfonic acid is a fused heterocyclic compound explicitly listed in HTS 2934.99.03.00, featuring an oxadiazole ring fused to naphthalene with a sulfonic acid substituent. This aromatic heterocyclic compound serves as a dye intermediate and reagent in organic synthesis. Chapter 29 classification applies to its chemically defined heterocyclic structure.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for structural analogs or derivatives
Other heterocyclic compounds if not exactly matching named naphthoxadiazole structure
If sulfonic acid function primary
Sulfonic acids of aromatic hydrocarbons in 2904 if heterocycle not considered principal characteristic
If imported as dye intermediate
Synthetic organic coloring intermediates shift to Chapter 32 per Chapter 29 exclusion note (g)
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Import Tips & Compliance
• Provide CAS number and NMR spectra confirming exact naphthoxadiazole structure to match specific HTS naming
• Include stability data as sulfonic acids are corrosive; DOT shipping papers required for hazardous classification
• Document <1% heavy metal impurities to avoid Chapter 28 inorganic salt classification
Related Products under HTS 2934.99.03.00
2-Acetylbenzo(b)thiophene
2-Acetylbenzo(b)thiophene is a specific aromatic heterocyclic compound featuring a thiophene ring fused to a benzene ring with an acetyl group at the 2-position. It falls under HTS 2934.99.03.00 as one of the explicitly named 'other heterocyclic compounds' in the aromatic category of Chapter 29. This chemically defined organic compound is used as an intermediate in pharmaceutical and agrochemical synthesis.
3-Methylene-7-(2-Phenoxyacetamido)-Cephan-4-Carboxylic Acid, p-Nitrobenzyl Ester, 1-Oxide
This complex beta-lactam derivative is a specific cephalosporin intermediate with a dihydrothiazine ring, explicitly named in HTS 2934.99.03.00 as an aromatic/modified aromatic heterocyclic compound. The p-nitrobenzyl ester protects the carboxylic acid during synthesis of semi-synthetic antibiotics. It qualifies under Chapter 29 for chemically defined heterocyclic compounds used in pharmaceutical manufacturing.
2-Acetylbenzo(b)thiophene Technical Grade
Technical grade 2-Acetylbenzo(b)thiophene (95-98% purity) matches the specific chemical explicitly named in HTS 2934.99.03.00 as an aromatic heterocyclic compound. Used in scale-up pharmaceutical synthesis, it qualifies under Chapter 29 for chemically defined organic compounds with permitted impurities. The fused thiophene-benzene structure with acetyl functionality defines its classification.
Naphth[1,2-d]-[1,2,3]-Oxadiazole-5-Sulfonic Acid Sodium Salt
The sodium salt of Naphth[1,2-d]-[1,2,3]-oxadiazole-5-sulfonic acid, explicitly covered in HTS 2934.99.03.00, maintains the aromatic heterocyclic classification of Chapter 29. This water-soluble form is preferred for dye manufacturing processes. Salts of organic compounds remain classified with the parent acid per Chapter 29 note 3(C)(1).