Other
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Other: > Other: > Aromatic or modified aromatic: > Other: > Other: > Other > Other
Duty Rate (from China)
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 2933.99.82.90
Caffeine Anhydrous Powder
Pure caffeine (1,3,7-trimethylxanthine), a purine alkaloid with a fused pyrimidine-imidazole ring system containing nitrogen hetero-atoms only. Classified under 2933.99.8290 as a heterocyclic compound with nitrogen hetero-atoms only, aromatic, not elsewhere specified. Used in pharmaceuticals, energy drinks, and as a chemical intermediate.
Theobromine Powder
Theobromine (3,7-dimethylxanthine), a xanthine alkaloid with nitrogen-containing fused heterocyclic rings, extracted from cocoa or synthesized. Falls under 2933.99.8290 as 'other' aromatic heterocyclic nitrogen compounds not specifically named elsewhere. Used in pharmaceuticals and as a research chemical.
Paroxetine Hydrochloride
Paroxetine HCl, an antidepressant SSRI with a piperidine fused to tetrahydronaphthalene ring system (nitrogen hetero-atom only). Classified in 2933.99.8290 as other aromatic/modified aromatic heterocyclic compounds with N hetero-atoms. Bulk API for pharmaceutical manufacture.
Imatinib Mesylate
Imatinib mesylate, tyrosine kinase inhibitor with pyrimidine and piperazine rings (N hetero-atoms only), used in leukemia treatment. HTS 2933.99.8290 for bulk API as other aromatic heterocyclic nitrogen compounds. Key oncology pharmaceutical intermediate.
Memantine Hydrochloride
Memantine HCl, NMDA receptor antagonist with adamantane amine structure containing only nitrogen hetero-atoms. Classified 2933.99.8290 as other heterocyclic N compounds, aromatic/modified aromatic. Bulk API for Alzheimer's treatment.
Piperazine Anhydrous
Piperazine, a six-membered heterocyclic ring with two nitrogen hetero-atoms, fully saturated but considered modified aromatic. Classified 2933.99.8290 as other heterocyclic N compounds. Used as anthelmintic and chemical intermediate.
Nicotine Free Base
Nicotine (3-(1-methylpyrrolidin-2-yl)pyridine), bicyclic N-heterocyclic alkaloid with pyridine and pyrrolidine rings. 2933.99.8290 as other aromatic heterocyclic nitrogen compounds. Used in vaping products and NRT.
Loperamide Hydrochloride
Loperamide HCl, antidiarrheal with piperidine ring attached to substituted diphenylmethane. Nitrogen hetero-atoms only in heterocyclic system. 2933.99.8290 other aromatic N-heterocycles. OTC and Rx antidiarrheal API.
Dicyclomine Hydrochloride
Dicyclomine HCl, antispasmodic with piperidine ring, nitrogen hetero-atom only heterocycle. 2933.99.8290 as other heterocyclic N compounds. Bulk API for IBS treatment.
Tolterodine Tartrate
Tolterodine tartrate, urinary antimuscarinic with piperidine ring system (N hetero-atoms only). HTS 2933.99.8290 other aromatic heterocyclic nitrogen compounds. Overactive bladder treatment API.
Granisetron Hydrochloride
Granisetron HCl, 5-HT3 antagonist with indazole fused to azabicyclo[2.2.2]octane (N hetero-atoms only). 2933.99.8290 other heterocyclic N compounds. Antiemetic API for chemotherapy.
Tropicamide
Tropicamide, mydriatic cycloplegic with tropic acid ester of 2-phenylbenzimidazole (N-heterocycle only). HTS 2933.99.8290 other aromatic heterocyclic nitrogen compounds. Ophthalmic API.
Aminophylline USP
Aminophylline, theophylline-ethylenediamine complex (1:2), nitrogen heterocyclic purine derivative. HTS 2933.99.8290 as other aromatic heterocyclic compounds with N hetero-atoms only. Used in respiratory pharmaceuticals.
Pyrantel Pamoate
Pyrantel pamoate, anthelmintic with pyrimidine ring and tertiary amine, nitrogen hetero-atoms only. HTS 2933.99.8290 for other aromatic heterocyclic N compounds. Veterinary and human deworming medication API.
Fesoterodine Fumarate
Fesoterodine fumarate, prodrug of 5-HMT with piperidine N-heterocycle. 2933.99.8290 as other aromatic heterocyclic nitrogen compounds. Bulk API for overactive bladder.