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).
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If sodium salt form (Phenytoin Sodium)
Organic salts classified with parent compound per Chapter 29 note on salts
If medicinal preparations containing phenytoin
Mixed medicaments in dosage form classify in Chapter 30
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Import Tips & Compliance
• Submit FDA bulk drug substance notification with DMF reference,Include USP/NF or EP certificate of analysis confirming identity and purity,Prevent confusion with sodium salt form which may have different documentation
Related Products 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.
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.