Heading 2933 · Heterocyclic compounds with nitrogen hetero-atom(s) only
2933.19
Heterocyclic compounds with nitrogen hetero-atom(s) only — Other:
Official notices
Actions of the President, the USTR or U.S. Customs and Border Protection (CBP) that name this code.
- Sep 23, 2026 · Commerce Guidance and Procedures for Implementing Tariff Adjustments for Specialty Pharmaceuticals and Associated Pharmaceutical Ingredients and Technical Corrections to the Harmonized Tariff Schedule of the United States for Duties Imposed Under Proclamation 11020
- Jul 23, 2026 · The White House Actions by the United States in the Investigations Under Section 301 of the Trade Act of 1974 of the Acts, Policies, and Practices of 60 Economies Related to the Failure of Each Economy To Impose and Effectively Enforce a Prohibition on the Importation of Goods Produced With Forced Labor
- Jul 20, 2026 · The White House Action by the United States in the Investigation Under Section 301 of the Trade Act of 1974 of Brazil's Acts, Policies, and Practices Related to Digital Trade and Electronic Payment Services; Unfair, Preferential Tariffs; Anti-Corruption Enforcement; Intellectual Property Protection; Ethanol Market Access; and Illegal Deforestation
- Apr 2, 2026 · The White House Adjusting Imports of Pharmaceuticals and Pharmaceutical Ingredients Into the United States
- Feb 20, 2026 · The White House Imposing a Temporary Import Surcharge To Address Fundamental International Payments Problems
- Dec 18, 2025 · USTR Implementing Certain Tariff-Related Elements of the Framework for a United States-Switzerland-Liechtenstein Agreement on Fair, Balanced, and Reciprocal Trade
- Nov 14, 2025 · The White House Modifying the Scope of the Reciprocal Tariffs With Respect to Certain Agricultural Products
- Sep 25, 2025 · USTR Implementing Certain Tariff-Related Elements of the U.S.-EU Framework on an Agreement on Reciprocal, Fair, and Balanced Trade
- Sep 5, 2025 · The White House Modifying the Scope of Reciprocal Tariffs and Establishing Procedures for Implementing Trade and Security Agreements
- Apr 2, 2025 · The White House Regulating Imports With a Reciprocal Tariff To Rectify Trade Practices That Contribute to Large and Persistent Annual United States Goods Trade Deficits
Mentioned in Chapter 99
The parts of Chapter 99, in the 2026 HTS Revision 22, that list HTS 2933.19, a broader code that includes it, or a narrower code within it.
| U.S. note | Excerpt | Headings that refer to it |
|---|---|---|
| U.S. note 2(aa)(ii) | (ii) As provided in heading 9903.03.03, the additional duty imposed by heading 9903.03.01 shall not apply to articles the product of any country that are classifiable in the following subheadings of the HTSUS: [Compiler's note: List may… | 9903.03.01, 9903.03.03 |
| U.S. note 2(v)(iii)(a) | (a) As provided for in heading 9903.01.32, the additional duties imposed by headings 9903.01.25, 9903.01.35, 9903.01.39, 9903.01.63, 9903.02.01–9903.02.73, 9903.02.79–9903.02.80, 9903.02.82–9903.02.83, and 9903.02.87–9903.02.88 shall not… | 9903.01.25, 9903.01.32, 9903.01.43, 9903.01.44, 9903.01.45, 9903.01.46 and 107 more |
| U.S. note 2(v)(xxiii) | (xxiii) As provided in heading 9903.02.77, the additional duties imposed by headings 9903.02.19 and 9903.02.20 shall not apply to articles the product of the European Union that are not patented in the United States for use in… | 9903.01.25, 9903.01.43, 9903.01.44, 9903.01.45, 9903.01.46, 9903.01.47 and 106 more |
| U.S. note 2(v)(xxv)(d) | (d) As provided in headings 9903.02.86 and 9903.02.91, the additional duties imposed by headings 9903.02.82–9903.02.83 and 9903.02.87–9903.02.88 shall not apply to articles the product of Switzerland or Liechtenstein, respectively, that… | 9903.01.25, 9903.01.43, 9903.01.44, 9903.01.45, 9903.01.46, 9903.01.47 and 107 more |
| U.S. note 20(f) | (f) Heading 9903.88.03 applies to all products of China that are classified in the following 8-digit subheadings, except products of China granted an exclusion by the U.S. Trade Representative and provided for in (1) heading 9903.88.13 and… | 9903.88.03, 9903.88.09 |
| U.S. note 20(s)(i) | (i) all products of China that are classified in the following 8-digit subheadings: [ Compiler's note: numbers in this table read from left to right] | 9903.88.15 |
| U.S. note 40(c) | (c) The headings provided in subdivision (a) of this note and the defined terms of this subdivision apply to articles that are classifiable in the following provisions of the HTSUS: | 9903.04.60, 9903.04.61, 9903.04.62, 9903.04.63, 9903.04.64, 9903.04.65 and 3 more |
| U.S. note 50(a)(v) | (v) As provided in heading 9903.05.06, the additional duty imposed by heading 9903.05.01 shall not apply to articles the product of Brazil for use in pharmaceutical applications, and that are classifiable in the following provisions of the… | 9903.05.01, 9903.05.06 |
| U.S. note 52(b) | (b) As provided in heading 9903.05.86, the duties imposed by headings 9903.05.20–9903.05.84 shall not apply to articles that are classifiable in the following provisions of the HTSUS: | 9903.05.20, 9903.05.21, 9903.05.22, 9903.05.23, 9903.05.24, 9903.05.25 and 60 more |
| U.S. note 52(e) | (e) As provided in heading 9903.05.89, the additional duties imposed by headings 9903.05.20–9903.05.84 shall not apply to articles that are for use in pharmaceutical applications and that are classifiable in the following provisions of the… | 9903.05.20, 9903.05.21, 9903.05.22, 9903.05.23, 9903.05.24, 9903.05.25 and 60 more |
Being listed is not owing a duty. A note may list goods that a measure leaves out; whether a heading applies depends on the origin, the date and the product; and the measures on all the goods of a country list no code at all. The calculator says what applies.
In the tariff
- 2933Heterocyclic compounds with nitrogen hetero-atom(s) only
- Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure
- 2933.19Other
- Aromatic or modified aromatic
- 2933.19.04.00Aminomethylphenylpyrazole (Phenylmethylaminopyrazole); and 3-Methyl-1-(p-tolyl)-2-pyrazolin-5-one (p-Tolyl methyl pyrazolone)Free
- 2933.19.08.003-(5-Amino-3-methyl-1H-pyrazol-1-yl)- benzenesulfonic acid; Amino-J-pyrazolone; 3-Amino-1-(2,4,6-trichlorophenyl)-5- pyrazolone; 3-Carboxy-1,4-sulfophenylpyrazol-5-one; 4-Chloro-3-(3-methyl-5-oxo-2-pyrazolin-1- yl)benzenesulfonic acid; 1-(m-Chlorophenyl)-3-methyl-2-pyrazolin- 5-one;p-Chloropyrazolone; 1-(2',5'-Dichlorophenyl)-3-methyl-2- pyrazolin-5-one; 1-(o-Ethylphenyl)-3-methyl-2-pyrazolin- 5-one; 5-Imino-3-methyl-1-phenylpyrazole; 5-Imino-3-methyl-1-(m-sulfophenyl)- pyrazole; 2,4-Methylcarboxypyrazolic acid; Methylphenylpyrazolone; and Sulfinpyrazone5.8%
- 2933.19.15.001,2-Dimethyl-3,5-diphenyl-1H-pyrazolium methyl sulfate (Difenzoquat methyl sulfate)Free
- 2933.19.18.002-Chloro-5-sulfophenylmethylpyrazolone; 2,5-Dichloro-4-(3-methyl-5-oxo-2- pyrazolin-1-yl) benzenesulfonic acid; Phenyl carbethoxypyrazolone;m-Sulfaminopyrazolone (m-Sulfamido- phenyl methyl pyrazolone); and 1-(p-Sulfophenyl)-3-methyl pyrazoloneFree
- Other
- 2933.19.23.00Pesticides6.5%
- 2933.19.30Photographic chemicals6.5%
- 2933.19.30.10Couplers, for use in color negative photographic paper
- 2933.19.30.95Other
- 2933.19.35.00Drugs6.5%
- Other
- 2933.19.37.00Products described in additional U.S. note 3 to section VI6.5%
- 2933.19.43.00Other6.5%
- Other
- 2933.19.45.00Drugs3.7%
- Other
- 2933.19.70.003-Methyl-5-pyrazoloneFree
- 2933.19.90.00Other6.5%