HS Heading 2933 : Heterocyclic compounds with nitrogen hetero-atom(s) only
HEADING DEFINITION & DISAMBIGUATION
HS Heading 2933 encompasses heterocyclic compounds with nitrogen hetero-atom(s) only. It classifies 27 6-digit WCO subheadings within Chapter 29 under the Harmonized System [USITC HTS 2026].
Subheadings Under Heading 2933
| HS Code | WCO 6-Digit Subheading Description | Chapter | Operational Package |
|---|---|---|---|
| 2933.11 | Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, Phenazone (Antipyrine) and its derivatives | 29 | View 2933.11 Package → |
| 2933.19 | Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, Other | 29 | View 2933.19 Package → |
| 2933.21 | Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Hydantoin and its derivatives | 29 | View 2933.21 Package → |
| 2933.29 | Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other | 29 | View 2933.29 Package → |
| 2933.31 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, Pyridine and its salts | 29 | View 2933.31 Package → |
| 2933.32 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, Piperidine and its salts | 29 | View 2933.32 Package → |
| 2933.33 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, Alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN), fentanyl (INN), ketobemidone (INN), methylphenidate (INN), pentazocine (INN), pethidine (INN), pethidine (INN) intermediate A, phencyclidine (INN) (PCP), phenoperidine (INN), pipradrol (INN), piritramide (INN), propiram (INN), remifentanil (INN) and trimeperidine (INN); salts thereof | 29 | View 2933.33 Package → |
| 2933.34 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, Other fentanyls and their derivatives | 29 | View 2933.34 Package → |
| 2933.35 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 3-Quinuclidinol | 29 | View 2933.35 Package → |
| 2933.36 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 4-Anilino-N-phenethylpiperidine (ANPP) | 29 | View 2933.36 Package → |
| 2933.37 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, N-Phenethyl-4-piperidone (NPP) | 29 | View 2933.37 Package → |
| 2933.39 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure, Other | 29 | View 2933.39 Package → |
| 2933.41 | Compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused, Levorphanol (INN) and its salts | 29 | View 2933.41 Package → |
| 2933.49 | Compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused, Other | 29 | View 2933.49 Package → |
| 2933.52 | Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, Malonylurea (Barbituric acid) and its salts | 29 | View 2933.52 Package → |
| 2933.53 | Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof | 29 | View 2933.53 Package → |
| 2933.54 | Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, Other derivatives of malonylurea (barbituric acid); salts thereof | 29 | View 2933.54 Package → |
| 2933.55 | Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, Loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof | 29 | View 2933.55 Package → |
| 2933.59 | Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, Other | 29 | View 2933.59 Package → |
| 2933.61 | Compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure, Melamine | 29 | View 2933.61 Package → |
| 2933.69 | Compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure, Other | 29 | View 2933.69 Package → |
| 2933.71 | Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, 6-Hexanelactam (ε-Caprolactam) | 29 | View 2933.71 Package → |
| 2933.72 | Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Clobazam (INN) and methyprylon (INN) | 29 | View 2933.72 Package → |
| 2933.79 | Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams | 29 | View 2933.79 Package → |
| 2933.91 | Heterocyclic compounds with nitrogen hetero-atom(s) only, Other, Alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), flurazepam (INN), halazepam (INN), lorazepam (INN), lormetazepam (INN), mazindol (INN), medazepam (INN), midazolam (INN), nimetazepam (INN), nitrazepam (INN), nordazepam (INN), oxazepam (INN), pinazepam (INN), prazepam (INN), pyrovalerone (INN), temazepam (INN), tetrazepam (INN) and triazolam (INN); salts thereof | 29 | View 2933.91 Package → |
| 2933.92 | Heterocyclic compounds with nitrogen hetero-atom(s) only, Other, Azinphos-methyl | 29 | View 2933.92 Package → |
| 2933.99 | Heterocyclic compounds with nitrogen hetero-atom(s) only, Other, Other | 29 | View 2933.99 Package → |
DISAMBIGUATION & CLASSIFICATION GUIDE
How to Select the Correct Subheading Under Heading 2933
Commercial shipments must be declared under the exact 6-digit WCO subheading that matches physical, chemical, or processing characteristics. Review the subheading descriptions above and verify against binding CBP CROSS rulings prior to entry filing.
Official Primary Sources & Authority References
USITC HTS Heading 2933 ↗
United States International Trade Commission official Harmonized Tariff Schedule.
CBP CROSS Rulings ↗
CBP e-Rulings database for Heading 2933 precedent rulings.
WCO Nomenclature ↗
World Customs Organization Harmonized System 2022 nomenclature standard.
U.S. Census Foreign Trade ↗
U.S. Census Bureau HTS-to-NAICS concordance and Schedule B export database.
Heading 2933 Frequently Asked Questions (FAQ)
What commercial articles are grouped under HS Heading 2933?
HS Heading 2933 covers Heterocyclic compounds with nitrogen hetero-atom(s) only, grouping 27 6-digit WCO subheadings.
How are 6-digit subheadings structured under Heading 2933?
Subheadings under Heading 2933 range from 2933.11 to 2933.90, classifying goods by processing state, origin, or material composition.
What is the representative US import duty rate for Heading 2933?
US MFN general duty rates for Heading 2933 commodities range from Duty-Free up to representative ad valorem percentages under the 2026 US HTS.
Are Section 301 tariffs applicable to goods under Heading 2933?
Section 301 additional tariffs depend on the specific 8-digit or 10-digit US HTS code and country of origin (e.g. China Lists 1–4A).
What PGA message set flags apply to Heading 2933?
Partner Government Agency flags (FDA, USDA APHIS, EPA) apply depending on the specific commodity sub-classification.
How do I distinguish between subheadings under Heading 2933?
Review WCO subheading terms and candidate descriptions. For example, unroasted vs. roasted or decaffeinated vs. non-decaffeinated.
Can goods under Heading 2933 enter duty-free under USMCA?
Yes. Goods originating in USMCA territories (US, Mexico, Canada) enter duty-free under SPI code P with a valid Certificate of Origin.
What is the Section 321 de minimis limit for Heading 2933?
Eligible import shipments valued at $800 USD or less imported by one person on one day enter duty-free under 19 U.S.C. 1321.
What documents are required for formal customs entry of Heading 2933?
Commercial Invoice, Packing List, Bill of Lading, and CBP Form 7501 are mandatory for entries exceeding $2,500 USD.
How can an importer get a binding CBP classification ruling for Heading 2933?
Importers may apply for a binding ruling via CBP National Commodity Specialist Division under 19 CFR Part 177.