Hydantoin and its derivatives
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure: > Hydantoin and its derivatives
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 2933.21.00.00
Phenylephrine HCl
Phenylephrine hydrochloride is a sympathomimetic amine and hydantoin derivative used as a nasal decongestant in cold and allergy medications. It falls under HTS 2933.21.00.00 as a derivative of hydantoin, a heterocyclic compound containing an unfused imidazole ring. This classification applies to its chemically defined organic structure meeting Chapter 29 requirements.
Methylethylketone Peroxide Stabilized with Hydroxypropyl Methacrylate
This is a hydantoin-structured curing agent used in polymer composites and gelcoat resins, stabilized for safe transport. Classified under HTS 2933.21.00.00 due to its hydantoin core meeting the unfused imidazole ring definition in Chapter 29 notes. The stabilizer qualifies under note (f) for preservation.
Dimethylol Propylene Urea
A hydantoin derivative used as a formaldehyde-free crosslinking agent in textile finishing and paper treatment. Falls under HTS 2933.21.00.00 as a chemically defined compound with unfused imidazole ring structure. Meets Chapter 29 criteria for separate organic compounds.
5,5-Diphenylhydantoin (Phenytoin Base)
The active pharmaceutical base form of the anticonvulsant phenytoin, a classic hydantoin derivative. Classified under HTS 2933.21.00.00 for its unfused imidazole ring structure as a separate chemically defined organic compound per Chapter 29 note (a).
Nitroso-Dimethylol Urea
A hydantoin derivative used as a slow-release nitrogen source in agricultural applications and slow-cure resins. Meets HTS 2933.21.00.00 criteria as a derivative containing unfused imidazole ring, chemically defined per Chapter 29.
Allantoin USP
Allantoin is a hydantoin derivative used in cosmetics, pharmaceuticals, and wound healing products for its soothing properties. Classified under HTS 2933.21.00.00 as it contains the unfused imidazole ring structure meeting Chapter 29 definitions for separate organic compounds.
Methone (5,5-Dimethylhydantoin)
Methone serves as an intermediate in pharmaceutical synthesis and polymer modification, featuring the core hydantoin structure. Falls under HTS 2933.21.00.00 per Chapter 29 classification for unfused imidazole ring compounds.
Parabanic Acid
Parabanic acid, a simple hydantoin derivative, serves as an analytical reagent and synthetic intermediate. Classified under HTS 2933.21.00.00 for its unfused imidazole ring structure as a chemically defined organic compound.