5,5-Diphenylhydantoin (Phenytoin Base) from Mexico
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).
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• 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