CLA-2-29: OT: RR: NC: N2:238

Ms. Sheila Heerdt
Ren Pharm International Ltd.
350 Jericho Turnpike, Suite 204
Jericho, NY 11753

RE: The tariff classification of Tiopronin (CAS number 1953-02-2) in bulk powder form, from Italy

Dear Ms. Heerdt:

In your letter dated November 29, 2016, you requested a tariff classification ruling.

The subject product, Tiopronin, is a prescription thiol drug that is indicated for the prevention of cysteine kidney stone formation.

The applicable subheading for the Tiopronin in bulk powder form will be 2930.90.4920, Harmonized Tariff Schedule of the United States (HTSUS), which provides for "Organo-sulfur compounds: Other: Other: Other: Acids: Other: Mercaptocarboxylic acids.” Pursuant to General Note 13, HTSUS, the rate of duty will be free.

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

This merchandise may be subject to the Federal Food, Drug, and Cosmetic Act and/or The Public Health Security and Bioterrorism Preparedness and Response Act of 2002 (The Bioterrorism Act), which are administered by the U.S. Food and Drug Administration (FDA). Information on the Federal Food, Drug, and Cosmetic Act, as well as The Bioterrorism Act, can be obtained by calling the FDA at 1-888-463-6332, or by visiting their website at

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 Judy Lee at


Steven A. Mack
National Commodity Specialist Division