U.S. Customs and Border Protection · CROSS Database · 1 HTS code referenced
Primary HTS Code
2933.99.9700
$128.7M monthly imports
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Ruling Age
20 years
Data compiled from CBP CROSS Rulings, Census Bureau Trade Data · As of 2026-05-04 · Updates monthly
The tariff classification of N-Boc-Trans-4-Hydroxy-L-Proline Methyl Ester (CAS 74844-91-0) from Italy.
NY L88659 January 23, 2006 CLA-2-29:RR:NC:2:239 L88659 CATEGORY: Classification TARIFF NO.: 2933.99.9700 Mr. Joseph Chivini Austin Chemical Company 1565 Barclay Blvd. Buffalo Grove, IL 60089 RE: The tariff classification of N-Boc-Trans-4-Hydroxy-L-Proline Methyl Ester (CAS 74844-91-0) from Italy. Dear Mr. Chivini: In your letter dated November 4, 2005, you requested a tariff classification ruling for N-Boc-Trans-4-Hydroxy-L-Proline Methyl Ester which you have stated will be used as a pharmaceutical intermediate. The applicable subheading will be 2933.99.9700, Harmonized Tariff Schedule of the United States (HTS), which provides for heterocyclic compounds with nitrogen hetero-atom(s) only: other: other. The rate of duty will be 6.5 percent ad valorem. Duty rates are provided for your convenience and are subject to change. The text of the most recent HTSUS and the accompanying duty rates are provided on World Wide Web at http://www.usitc.gov/tata/hts/. This ruling is being issued under the provisions of Part 177 of the Customs Regulations (19 C.F.R. 177). A copy of the ruling or the control number indicated above should be provided with the entry documents filed at the time this merchandise is imported. If you have any questions regarding the ruling, contact National Import Specialist Richard Dunkel at 646-733-3032. Sincerely, Robert B. Swierupski Director, National Commodity Specialist Division