5,5-Diphenylhydantoin (Phenytoin Base) from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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