Biligrafin Acid
Biligrafin acid is a specific aromatic cyclic amide derivative used primarily as a contrast agent in medical imaging procedures like cholangiography. It falls under HTS 2924.29.0500 as it is explicitly named in the tariff description for carboxyamide-function compounds that are aromatic cyclic amides. This chemically defined organic compound is imported in pure form for pharmaceutical manufacturing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as a salt form for specific solubility
Salts of these acids may classify under heterocyclic compounds with nitrogen hetero-atom(s) only if the structure fits, per chapter notes on salts.
If when used primarily as a hormone intermediate
Chapter notes allow reclassification to sugars or derivatives if chemically modified, but typically stays in 2924; last numerical order rule applies.
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Import Tips & Compliance
• Verify purity certificates and provide chemical safety data sheets (SDS) for customs clearance; ensure FDA compliance for pharmaceutical precursors
• Common pitfall: incorrect labeling as a finished drug instead of bulk chemical
Related Products under HTS 2924.29.05.00
3,5-Diacetamido-2,4,6-Triiodobenzoic Acid
This iodinated aromatic benzoic acid derivative with acetamido groups is a key intermediate for radiographic contrast media in X-ray diagnostics. Classified under HTS 2924.29.0500 as an explicitly listed aromatic cyclic amide-function compound of carbonic acid. It is a separate chemically defined organic compound meeting chapter 29 scope.
Metrizoic Acid
Metrizoic acid, or 3-acetamido-2,4,6-triiodo-5-(N-methylacetamido)benzoic acid, serves as a precursor for water-soluble contrast agents in medical imaging. It is specifically named in HTS 2924.29.0500 for its aromatic cyclic amide structure under carboxyamide-function compounds. This pure organic compound aligns with chapter notes for separate chemically defined substances.
Biligrafin Acid Pharmaceutical Grade Powder
High-purity biligrafin acid powder meets USP standards for synthesis of gallbladder contrast agents. Explicitly under HTS 2924.29.0500 as a named aromatic amide derivative, fitting chapter 29 for chemically defined organic compounds without impurities affecting classification.
Metrizoic Acid Technical Grade
Technical grade metrizoic acid is used in industrial synthesis of iodinated contrast media for CT scans. Classified precisely in HTS 2924.29.0500 as a listed aromatic cyclic amide-function compound, per chapter notes excluding finished medicaments.
3,5-Diacetamido-2,4,6-Triiodobenzoic Acid Crystals
Crystalline form of this triiodinated benzoic acid derivative is imported for high-precision contrast agent production. HTS 2924.29.0500 explicitly covers it as an aromatic amide of carbonic acid, adhering to chapter rules for pure compounds.
Biligrafin Acid with Stabilizer
Stabilized biligrafin acid includes anticaking agents for safe transport, still classified as the pure compound per chapter note (f). HTS 2924.29.0500 applies to this named aromatic cyclic amide used in diagnostic imaging.