Other
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure: > Other: > Drugs: > Aromatic or modified aromatic: > Other
Duty Rate (from China)
Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
Articles of aluminum, of steel or of copper or derivative aluminum or steel articles; passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; medium- and heavy-duty vehicles; parts of medium- and heavy-duty vehicles; wood products; patented pharmaceutical articles; and semiconductor articles, as provided in subdivision (f) of U.S. note 52 to this subchapter
What changed
Since July 3, 2026, for imports from China
- •Section 232 Pharma — Patented (9903.04.60) now applies: +93.5%
Products classified under HTS 2933.59.53.00
Trimetrexate Glucuronate
Trimetrexate is a folic acid antagonist with pyrimidine structure, used in cancer therapy. Imports as HTS 2933.59.53.00 aromatic drug with salts classified to acid per note 5(C). Heterocyclic nitrogen-only per notes.
Oteracil Potassium Salt
Oteracil is a pyrimidine derivative in cancer drugs like S-1, inhibiting toxicity. HTS 2933.59.53.00 for aromatic pyrimidine drugs; salts to organic base per notes. Chemically defined per Chapter 29.
Pyrimethamine Base
Pyrimethamine is an antifolate drug with aromatic pyrimidine ring, used for malaria. HTS 2933.59.53.00 covers this as other aromatic pyrimidine drug. Pure compound fits Chapter 29(a) definition.
Aminophylline USP Powder
Aminophylline is a heterocyclic compound containing a xanthine (purine) structure with pyrimidine rings, used as a bronchodilator drug for asthma treatment. It falls under HTS 2933.59.53.00 as an aromatic drug with pyrimidine hetero-atoms in its structure. This classification applies to its chemically defined organic nature per Chapter 29 notes.
Theophylline Anhydrous API
Theophylline is a methylxanthine drug with fused pyrimidine-imidazole rings, used for respiratory disorders. Classified in HTS 2933.59.53.00 due to its aromatic pyrimidine structure and status as a pharmaceutical drug. Meets Chapter 29 criteria for separate chemically defined compounds.
Dipyridamole Powder
Dipyridamole is an aromatic antiplatelet drug featuring pyrimidine rings in its heterocyclic structure. It imports under HTS 2933.59.53.00 as a modified aromatic drug with nitrogen hetero-atoms only in pyrimidine form. Qualifies as a separate organic compound per Chapter 29 scope.
Idoxuridine Crystals
Idoxuridine is a pyrimidine nucleoside analog used as antiviral drug, with iodinated aromatic structure. Falls under HTS 2933.59.53.00 for aromatic pyrimidine drugs per hierarchy. Exclusively heterocyclic with nitrogen hetero-atoms as defined.
Flucytosine API
Flucytosine is a fluorinated pyrimidine antifungal drug with modified aromatic ring. Classified HTS 2933.59.53.00 as other aromatic pyrimidine drug. Adheres to Chapter 29 rules for halogenated derivatives.